41 6 uzd

#include <iostream>

using namespace std;

int main()
{
    int a,b,c,ab=0,ats=0,i;
    cin >> a >> b >> c;
    for (i=0; i<c; i++){
            if(ab<c){
                ab=ab+a+b;
                ats++;
                    }
    }

    cout << ats*2;

    return 0;
}