#include<stdio.h>
main()
{
	int n,k;
	float score,sum,ave;
	
	for(n=1;n<3;n++)
	{	sum=0.0;
		for(k=1;k<=4;k++)
		{scanf("%f",&score);
		sum+=score;
	}
	ave=sum/4.0;
	printf("NO%d:%f\n",n,ave);
	}
}