#include <iostream>
#include <cstdio>
#include <queue>
using namespace std;

#define maxn 110
#define INF 0xffff
int g[maxn][maxn];
int n;

struct node
{
    int v, key;
    friend bool operator<(node a, node b)
    {
        return a.key > b.key;
    }
};

bool visited[maxn];
node vx[maxn];
priority_queue<node> q;
void Prim()
{
    for(int i = 1; i <= n; i++)
    {
        vx[i].v = i;
        vx[i].key = INF;
        visited[i] = false;
    }
    vx[1].key = 0;
    q.push(vx[1]);
    while(!q.empty())
    {
        node nd = q.top();
        q.pop();
        int st = nd.v;
        if(visited[st])
            continue;
        visited[st] = true;
        for(int j = 1; j <= n; j++)
        {
            if(j != st && !visited[j] && vx[j].key > g[st][j])
            {
                vx[j].key = g[st][j];
                q.push(vx[j]);
            }
        }
    }
}
int main()
{
    int m, a, b;
    while(~scanf("%d", &n))
    {
        for(int i = 1; i <= n; i++)
        {
            for(int j = 1; j <= n; j++)
                scanf("%d", &g[i][j]);
            g[i][i] = INF;
        }
        scanf("%d", &m);
        while(m--)
        {
            scanf("%d%d", &a, &b);
            g[a][b] = g[b][a] = 0;
        }
        Prim();
        int ans = 0;
        for(int i = 1; i <= n; i++)
            ans += vx[i].key;
        printf("%d\n", ans);

    }
    return 0;
}

#include <iostream>
#include <cstdio>
#include <vector>
#include <queue>
using namespace std;

#define maxn 110  //最大顶点个数
int n, m;       //顶点数，边数

struct arcnode  //边结点
{
    int vertex;     //与表头结点相邻的顶点编号
    int weight;     //连接两顶点的边的权值
    arcnode * next; //指向下一相邻接点
    arcnode() {}
    arcnode(int v,int w):vertex(v),weight(w),next(NULL) {}
};

struct vernode      //顶点结点，为每一条邻接表的表头结点
{
    int vex;    //当前定点编号
    arcnode * firarc;   //与该顶点相连的第一个顶点组成的边
}Ver[maxn];

void Init()  //建立图的邻接表须要先初始化，建立顶点结点
{
    for(int i = 1; i <= n; i++)
    {
        Ver[i].vex = i;
        Ver[i].firarc = NULL;
    }
}
void Insert(int a, int b, int w)  //尾插法，插入以a为起点，b为终点，权为w的边，效率不如头插，可是能够去重边
{
    arcnode * q = new arcnode(b, w);
    if(Ver[a].firarc == NULL)
        Ver[a].firarc = q;
    else
    {
        arcnode * p = Ver[a].firarc;
        if(p->vertex == b)
        {
            if(p->weight > w)
                p->weight = w;
            return ;
        }
        while(p->next != NULL)
        {
            if(p->next->vertex == b)
            {
                if(p->next->weight > w);
                    p->next->weight = w;
                return ;
            }
            p = p->next;
        }
        p->next = q;
    }
}
void Insert2(int a, int b, int w)   //头插法，效率更高，但不能去重边
{
    arcnode * q = new arcnode(b, w);
    if(Ver[a].firarc == NULL)
        Ver[a].firarc = q;
    else
    {
        arcnode * p = Ver[a].firarc;
        q->next = p;
        Ver[a].firarc = q;
    }
}
struct node     //保存key值的结点
{
    int v;
    int key;
    friend bool operator<(node a, node b)   //自己定义优先级，key小的优先
    {
        return a.key > b.key;
    }
};

#define INF 0xfffff    //权值上限
bool visited[maxn]; //是否已经增加树
node vx[maxn];      //保存每一个结点与其父节点连接边的权值
priority_queue<node> q; //优先队列stl实现
void Prim()    //s表示根结点
{
    for(int i = 1; i <= n; i++) //初始化
    {
        vx[i].v = i;
        vx[i].key = INF;
        visited[i] = false;
    }
    vx[1].key = 0;
    q.push(vx[1]);
    while(!q.empty())
    {
        node nd = q.top();  //取队首，记得赶紧pop掉
        q.pop();
        if(visited[nd.v])   //注意这一句的深意，避免非常多不必要的操作
            continue;
        visited[nd.v] = true;
        arcnode * p = Ver[nd.v].firarc;
        while(p != NULL)    //找到全部相邻结点，若未訪问，则入队列
        {
            if(!visited[p->vertex] && p->weight < vx[p->vertex].key)
            {
                vx[p->vertex].key = p->weight;
                vx[p->vertex].v = p->vertex;
                q.push(vx[p->vertex]);
            }
            p = p->next;
        }
    }
}

int main()
{
    int m, a, b, x;
    while(~scanf("%d", &n))
    {
        Init();
        for(int i = 1; i <= n; i++)
        {
            for(int j = 1; j <= n; j++)
            {
                scanf("%d", &x);
                if(x != 0)
                    Insert2(i, j, x);
            }
        }
        scanf("%d", &m);
        while(m--)
        {
            scanf("%d%d", &a, &b);
            Insert(a, b, 0);
            Insert(b, a, 0);
        }
        Prim();
        int ans = 0;
        for(int i = 1; i <= n; i++)
            ans += vx[i].key;
        printf("%d\n", ans);

    }
    return 0;
}