#include <cstdio>
#include <algorithm>
using namespace std;
 
int main()
{
    double x, y, z, t;
	scanf( "%lf %lf %lf", &x, &y, &z );
	t = max(x, max(y, z)); 
    //if the triangle exists
    if( x + y + z > 2*t )
    {
        //if it is acute
        double COS_VALUE =  t*( x*x + y*y + z*z - 2*t*t ) / ( 2*x*y*z );
        if( COS_VALUE > 0 ) printf( "The triangle is acute." );
        else printf( "The triangle is not acute." );
    }
    else printf( "The triangle doesn't exist." );
    return 0;
}

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