#include <bits/stdc++.h>
using namespace std;
int a, b, c;
int main() {
  cin >> a >> b >> c;
  for (int i = 0; i < 2; i++) {
    for (int j = 0; j < 2; j++) {
      if ((a * i + b * j) <= c) {
        cout << "Yes" << endl;
        return 0;
      }
    }
  }
  cout << "No" << endl;
}
