POJ 1995

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#define LL __int64
using namespace std;

LL M;

LL quick(LL a,LL b){
	a%=M;
	LL ans=1;
	while(b){
		if(b&1)
		ans=(ans*a)%M;
		b>>=1;
		a=(a*a)%M;
	}
	return ans;
}

int main(){
	int T,n;
	LL a,b;
	scanf("%d",&T);
	while(T--){
		LL ans=0;
		scanf("%I64d",&M);
		scanf("%d",&n);
		for(int i=1;i<=n;i++){
			scanf("%I64d%I64d",&a,&b);
			ans=(ans+quick(a,b))%M;
		}
		printf("%I64d\n",ans);
	}
	return 0;
}