刷题统计c++实现

#include<iostream>
using namespace std;
long long int a,b,n;

int main(){
    cin>>a>>b>>n;
    long long int res = 0;
    res += (n/(a*5+b*2)==0)?0:(n/(a*5+b*2))*7;
    n %= a*5+b*2;
    while(n>0){
        if(res % 7 <5) n -= a;
        else n -= b;
        res++;
    }
    cout<<res<<endl;
}