#include <iostream>
using namespace std;

int N, M, C;

string res(void){
    if(N >= 2 && M >= 2 && (N*M)%2 == 0) return "YES";
    if(C == 1 || C == N*M) return "YES";
    if(C == N*M/2+1) return "YES";
    return "NO";
}

int main(){
    cin >> N >> M >> C;
    cout << res() << endl;
    return 0;
}