Untitled

#include <iostream>
#include <string>
using namespace std;

int main()
{
    setlocale(LC_ALL, "Russian");
    int n;
    int m;
    int k;
    cin >> n;
    cin >> m;
    cin >> k;
    if (k <= n*m) {
        cout << "YES";
    }
    else {
        cout << "NO";
    }
    
    //std::cout << "Hello World!\n";
}