#include<iostream>
using namespace std;
typedef long long LL;

LL mid(LL a,int b,int p)
{
    LL res = 1;
    for(; b ; b >>= 1)
    {
        if(b & 1) res = res * a % p;
        a = a * a % p;
    }
    return res;
}

int main()
{
    int q;
    scanf("%d",&q);
    while(q --)
    {
        int p,n;
        scanf("%d%d",&p,&n);
        LL res = 0;
        for(int i = 0 ; i < n ; ++i)
        {
            int a,b;
            scanf("%d%d",&a,&b);
            res += mid(a,b,p);
        }
        printf("%lld\n",res % p);
    }
    return 0;
}