#include <stdio.h>

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