Codeforces Round #354 (Div. 2) B

#include <iostream>
#include <cstdlib>
#include <algorithm>
using namespace std;

double a[13][13];

int main(){
int n,t;
cin >> n >> t;
a[1][1] = t;
for (int i = 1; i <= n; i++){
for (int j = 1; j <= n; j++){
if (a[i][j] >= 1.0){
double k = a[i][j]-1;
k /= 2;
a[i+1][j] += k, a[i+1][j+1] += k;
}
}
}
int cnt = 0;
for (int i = 1; i <= n; i++){
for (int j = 1; j <= n; j++){
if (a[i][j] >= 1.0) cnt++;
}
}
cout << cnt << endl;
return 0;
}