#include <stdio.h>

int main(void){
unsigned long long a,b,c,d;
scanf("%lld %lld %lld",&a,&b,&c);
d = c - a - b;
if (d > 0 && d * d > 4 * a * b)
{
printf( "Yes" );
}
 else
{
printf( "No" );
}
 return 0;
}