[ahu 1248] NBA Finals

#include <iostream>
#include <cstring>
#include <cstdio>
using namespace std;
#define N 210

int main()
{
    int n;
    double p;
    double dp[N][N];
    while(scanf("%d%lf",&n,&p)!=EOF)
    {
        memset(dp,0,sizeof(dp));
        for(int i=0;i<=n;i++) dp[0][i]=1;
        for(int i=1;i<=n;i++){
            for(int j=1;j<=n;j++){
                dp[i][j]=dp[i-1][j]*p+dp[i][j-1]*(1-p);
            }
        }
        printf("%.6f\n",dp[n][n]);
    }
    return 0;
}