/*#include <stdio.h>
int main()
{
int a, b;
scanf("%d %d", &a, &b);
if (b%a==0)
{
printf("%d*%d=%d", a, b/a, b);
}
else if(a%b==0)
{
printf("%d*%d=%d", b, a/b, a);
}
else
{
printf("none");
}
return 0;
}*/
/*#include <stdio.h>
int main()
{
int a, b, c;
scanf("%d %d %d", &a, &b, &c);
if(b-c==a)
{
printf("does not matter");
}
else if(b-c>a)
{
printf("advertise");
}
else
{
printf("do not advertise");
}
return 0;
}
*/
#include <stdio.h>
int main()
{
int a,b,c;
scanf("%d %d %d",&a,&b,&c);
if(a==b&&b==c)
{
printf ("정삼각형");
}
else if(a==b||b==c||a==c)
{
printf("이등변삼각형");
}
else if(a*a+b*b==c*c)
{
printf("직각삼각형");
}
else if(a+b<c)
{
printf("삼각형아님");
}
else
{
printf ("삼각형");
}
return 0;
}