题解 100% AC

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c=1;
    cin>>a>>b;
    for(int i=1;i<=b;i++){
        c*=a;
        c%=7;
    }
    if(c==0){
        cout<<"7";
    }else if(c==1){
        cout<<"1";
    }else if(c==2){
        cout<<"2";
    }else if(c==3){
        cout<<"3";
    }else if(c==4){
        cout<<"4";
    }else if(c==5){
        cout<<"5";
    }else{
        cout<<"6";
    }
	return 0;
}