#include <iostream>
#include <vector>

unsigned long long int gcd(unsigned long long int a, unsigned long long b) {
    return b ? gcd(b, a % b) : a;
}

int main() {
    int n, m;
    std::cin >> n >> m;
    unsigned long long int num = 1, den = 1, c;
    if (n > m) {
        std::vector <int> a(n + 1);
        for (int j = 2; j <= m; j++) {
            a[j] = j;
        }
        for (int i = n + 1; i < n + m; i++) {
            num *= i;
            for (int j = 2;j < m; j++) {
                    if (a[j] > -1) {
                    if (num % a[j] == 0) {
                        num /= a[j];
                        a[j] = -1;
                    } else {
                        den *= a[j];
                        a[j] = -1;
                    }
                }
            }
            if (num >= den) {
                c = gcd(num, den);
                num /= c;
                den /= c;
            }
        }
    } else if (n == m) {
        std::vector <int> a(n + 1);
        for (int j = 2; j <= n; j++) {
            a[j] = j;
        }
        for (int i = n + 1; i < n + m; i++) {
            num *= i;
            for (int j = 2; j < n; j++) {
                if (a[j] > -1) {
                    if (num % a[j] == 0) {
                        num /= a[j];
                        a[j] = -1;
                    } else {
                        den *= a[j];
                        a[j] = -2;
                    }
                }
            }
            if (num > den) {
                c = gcd(num ,den);
                num /= c;
                den /= c;
            }
        }
    } else {
        std::vector <int> a(m);
        for (int j = 2; j < m; j++) {
            a[j] = j;
        }
        for (int i = n + 1; i < n + m; i++) {
            num *= i;
            for (int j = 2; j < m; j++) {
                if (a[j] > -1) {
                    if (num % a[j] == 0) {
                        num /= a[j];
                        a[j] = -1;
                    } else {
                        den *= a[j];
                        a[j] = -2;
                    }
                }
            }
            if (num > den) {
                c = gcd(num, den);
                num /= c;
                den /= c;
            }
        }
    }
    std::cout << num;
    return 0;
}