#include <stdio.h>

int main( void )
{
	int	point_x, point_y;
	int	circle_x, circle_y, circle_r;
	int	x, y, len2, r2;

	printf( "点X=" );
	scanf( "%d", &point_x );

	printf( "点Y=" );
	scanf( "%d", &point_y );

	printf( "円X=" );
	scanf( "%d", &circle_x );

	printf( "円Y=" );
	scanf( "%d", &circle_y );

	printf( "円半径=" );
	scanf( "%d", &circle_r );

	x = point_x - circle_x;
	y = point_y - circle_y;
	len2 = x * x + y * y;
	r2 = circle_r * circle_r;
	if( len2 < r2 )
	{
		printf( "naibu\n" );
	}
	else if( len2 > r2 )
	{
		printf( "gaibu\n" );
	}
	else
	{
		printf( "enshuujou\n" );
	}

	return 0;
}