#include <stdio.h>
#include<math.h>

int main()
{
    int a,b,c;

    scanf("%d%d%d",&a,&b,&c);

    if(a + b > c&&a + c > b&&b + c > a)
    {
        if(a*a == b*b + c*c || b*b == a*a + c*c || c*c == a*a + b*b)
        {
            printf("yes");
        }
        else
            printf("no");
    }
    else
        printf("not a triangle");
   
    return 0;
}