#include <iostream>
#include <vector>
using namespace std;

int main(void) {
    int trick, treat;
    cin >> trick >> treat;
    
    int i = 3;
    vector<int> vec1(4, 0), vec2(4, 0);
    
    while (trick > 0) {
        vec1[i] = trick % 2;
        trick /= 2;
        --i;
    }
    i = 3;
    while (treat > 0) {
        vec2[i] = treat % 2;
        treat /= 2;
        --i;
    }
    
    int j = 1;
    long long x = 0;
    vector<int> vec3(4, 0);
    
    for (int i = 3; i >= 0; i--) {
        if (vec1[i]|| vec2[i]) vec3[i] = 1;
        x += j * vec3[i];
        j *= 2;
    }

    long long ans = 1;
    for (x; x >= 1; x--) {
        ans *= x;
    }
    
    cout << ans << endl;
    return 0;
}