#include<cstdio>
using namespace std;
typedef long long ll;
ll a,b,c;
int main()
{
	scanf("%lld%lld%lld",&a,&b,&c);
	if(c-a-b>0&&(c-a-b)*(c-a-b)>4ll*a*b)printf("Yes\n");
	else printf("No\n");
	return 0;
}