#include<cstdio>

 #include<cstring>

 #define F(i,a,b) for(int i=a;i<=b;++i)

 double a[][],eps=1e-,p;int n,k,ans;

 void fuck(){

     a[][]+=;

     F(i,,n-)F(j,,i)

     if(a[i][j]->eps)p=a[i][j]-,a[i][j]=,a[i+][j]+=p/,a[i+][j+]+=p/;

 }

 int main(){

     while(~scanf("%d%d",&n,&k)){

         memset(a,,sizeof(a));

         F(i,,k)fuck();ans=;

         F(i,,n)F(j,,i)if(a[i][j]>-eps)ans++;

         printf("%d\n",ans);

     }

     return ;

 }