#include <bits/stdc++.h>
using namespace std;
int main() {
  int a = 50;
  cin >> a;
  int b = 100;
  cin >> b;
  int c = 20;
  cin >> c;
  if (a + b > c) {
    cout << "Yes";
  } else {
    cout << "No";
  }
  return 0;
}
