#include<iostream>
using namespace std;
int main(){
    int a,b,n;
    cin>>a>>b>>n;
    int js=1,ts=0,t=0;
    while(t<n){
        if(js>7) js=1;
        if(js<6) t=t+a;
        else t=t+b;
        ts++;
        js++;
    }
    cout<<ts;
}

请大佬帮帮忙