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

int main()
{
    double a, b, c;
    scanf("%lg%lg%lg", &a, &b, &c);
    if (fabs(a*a + b*b - c*c) < 1e-10) {
        printf("That's a right-angled triangle\n");
    } else {
        printf("That is not a right-angled triangle\n");
#ifdef DEBUG
        printf("a**2 + b**2 = %g\n", a * a + b * b);
        printf("   c**2     = %g\n", c * c);
        printf("their difference is %g\n",
               fabs(a * a + b * b - c * c));
#endif
    }
    return 0;
}