#include <bits/stdc++.h>
using namespace std;
int main() {
  intmax_t x, y, sum;
  cin >> x >> y >> sum;
  if (sqrt(x) + sqrt(y) < sqrt(sum)) {
    if (fabsl((sqrtl(x) + sqrtl(y)) - sqrtl(sum)) <
        LDBL_EPSILON *
            fmax(1, fmax(fabs(sqrtl(x) + sqrtl(y)), fabs(sqrtl(sum))))) {
      cout << "No" << endl;
    } else {
      cout << "Yes" << endl;
    }
  } else {
    cout << "No" << endl;
  }
  return 0;
}
