#include <iostream> using namespace std; int main() { int a, b, c, d, e; cin >> a >> b >> c >> d >> e; if (a == 1)cout << "1" << endl; else if (b == 1)cout << "2" << endl; else if (c == 1)cout << "3" << endl; else if (d == 1)cout << "4" << endl; else if (e == 1)cout << "5" << endl; return 0; } // 64 位输出请用 printf("%lld")