#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{    int r,a,b,c,d;
    //int x,y;
    double x,y,z;
    int aa=1,bb=1,cc=1,dd=1;
    long int num=500000,zhuang=500000,wan=5000000;
    srand(time(NULL));
    for(d=0;d<num;d++)
    {
        
         r=rand()%6+1;
         a=rand()%6+1;
         b=rand()%6+1;
         c=rand()%6+1;
         if(r==a && r==b && r==c)
         {
            wan=wan+6;
            zhuang=zhuang-6;
            continue;
         }
         if(r==a && r==b || r==a && r==c || r==b && r==c)
         {
            wan=wan+2;
            zhuang=zhuang-2;
            continue;
         }
         if(r==a || r==b || r==c)
         {
            wan=wan+1;
            zhuang=zhuang-1;
            continue;
         }
         if(r*a==b*c || r*b==a*c || r*c==a*b)
        {
            wan=wan+0;
            zhuang=zhuang-0;
            continue;
        }
         wan=wan-1;
         zhuang=zhuang+1;     
    }
    x=zhuang-500000;
    y=500000.0;
    z=x/y;
    printf("%.3lf\n",z);
}