import java.util.* ;
import java.lang.* ;
import java.io.* ;
import java.math.* ;
import java.text.* ;
class Triangles
{
public static double square( double num) { return num* num; }
{
Scanner in
= new Scanner
( System .
in ) ; double s[ ] = new double [ 3 ] ;
for ( int i = 0 ; i < 3 ; i++ )
s[ i] = in.nextDouble ( ) ;
if ( s[ 0 ] + s[ 1 ] <= s[ 2 ] ) {
System .
out .
println ( "The triangle doesn't exist." ) ; }
else {
double cosValue
= Math .
cos ( ( square
( s
[ 0 ] ) + square
( s
[ 1 ] ) + square
( s
[ 2 ] ) ) / ( 2 * s
[ 0 ] * s
[ 1 ] ) ) ; if ( cosValue
> 0 ) System .
out .
println ( "The triangle is acute." ) ; else System .
out .
println ( "The triangle is not acute." ) ; }
}
}
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