#include <bits/stdc++.h>
using namespace std;
int main() {
int g,e,p;
cin>>g>>e>>p;
cout<<(g*3+e)<<endl;
return 0;
}
I2luY2x1ZGUgPGJpdHMvc3RkYysrLmg+CnVzaW5nIG5hbWVzcGFjZSBzdGQ7CgppbnQgbWFpbigpIHsKCWludCBnLGUscDsKCWNpbj4+Zz4+ZT4+cDsKCWNvdXQ8PChnKjMrZSk8PGVuZGw7CglyZXR1cm4gMDsKfQ==