#include<bits/stdc++.h>
using namespace std;
#define ll long long 
int t;
ll a,b,p,res;
ll qmi(ll a,ll b,ll p){
    ll res=1;
    while(b){
        if(b&1)res=res*a%p;
        a=a*a%p;
        b>>=1;
    }
    return res;
}
int main(){
    ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    cin>>t;
    while(t--){
        cin>>p;
        int h;
        cin>>h;
        res = 0;
        for(int i = 1;i<=h;i++){
            cin>>a>>b;
            res=res+qmi(a,b,p)%p;
        }
        cout<<res%p<<endl;
    }
    return 0;
}