#include <stdio.h>
#include <math.h>

int f(int n, int m) {
    if(n == 0)
        return m;
    if(n == 1)
        return m+1;
    return f(n-1, m+1) + (f(n-2, m+2) >> 1);
}

int main(int argc, char *argv[]) {
    int answer;
    
    int n = atoi(argv[1]);
    int m = atoi(argv[2]);
    
    answer = f(n,m);
    printf("%d\n", answer);
    return 1;
}