#include <bits/stdc++.h>
using namespace std;
#include <boost/multiprecision/cpp_int.hpp>
using namespace boost::multiprecision;

using ll = long long;
#define rep(i, n) for(int i = 0; i < n; i++)

int main() {
	string sa, sp, sq;
	cin >> sa >> sp >> sq;
	cpp_int a = 0, p = 0, q = 0;
	int s;
	int sz = sa.size();
	s = 1;
	rep(i, sz) {
		if(isdigit(sa[i])) a = a * 10 + sa[i] - '0';
		else s = -1;
	}
	a *= s;
	sz = sp.size();
	s = 1;
	rep(i, sz) {
		if(isdigit(sq[i])) p = p * 10 + sp[i] - '0';
		else s = -1;
	}
	p *= s;
	sz = sq.size();
	s = 1;
	rep(i, sz) {
		if(isdigit(sq[i])) q = q * 10 + sq[i] - '0';
		else s = -1;
	}
	q *= s;
	cpp_int b = (p + q) * a;
	cpp_int c = (p * q) * a;
	string ans = "No";
	if( b * b > 4 * a * c ) ans = "Yes";
	cout << ans << endl;
}