#include <bits/stdc++.h>
using namespace std;
constexpr int MOD = 1000000007;
template <class T>
inline bool chmin(T &a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T>
inline bool chmax(T &a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
void print(const std::vector<int> &v) {
  std::for_each(v.begin(), v.end(), [](int x) { std::cout << x << " "; });
  std::cout << std::endl;
}
int main() {
  int A, B, C;
  cin >> A >> B >> C;
  for (long long i = 0; i < (long long)2; i++) {
    for (long long j = 0; j < (long long)2; j++) {
      if (C >= A * (i + 1) + B * (i + 1)) {
        cout << "Yes" << endl;
        return 0;
      }
    }
  }
  cout << "No" << endl;
}
