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#include<iostream>
#include<cstdio>
using namespace std;
double dp[110][610],sum=1;
int n,m;
int main()
{
    cin>>n>>m;
    dp[0][0]=1.000;
    for(int i=1;i<=n;i++)
      for(int j=1;j<=m;j++)
        for(int k=1;k<=6;k++)
        {
            if(j>=k){
                dp[i][j]+=dp[i-1][j-k];
            }
        }
    for(int i=1;i<=n;i++)   sum*=6;
    double k=dp[n][m]*100/sum;
    printf("%.2lf",k);
    return 0;
}
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