#include<bits/stdc++.h>
#include"testlib.h"
using namespace std;
using ll = long long;

const ll HWmin = 1, HWmax = 1'000'000;
const ll Kmin = 1, Kmax = 1'000'000'000'000'000'000LL;

int main(){
    registerValidation();
    ll H = inf.readLong(HWmin,HWmax);
    inf.readSpace();
    ll W = inf.readLong(HWmin,HWmax);
    inf.readEoln();
    ll K = inf.readLong(Kmin,Kmax);
    inf.readEoln();
    inf.readEof();
    assert(H * W <= HWmin);
    return 0;
}