#include <bits/stdc++.h> using namespace std; #include <math.h> #include <iomanip> #include <cstdint> #include <string> #include <sstream> template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; } template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; } #define rep(i,n) for (int i = 0; i < (n); ++i) typedef long long ll; typedef long double ld; typedef unsigned long long ull; using P=pair<ll,ll>; const ll INF=1001001001; const int mod=998244353; void solve(){ int a,b; cin>>a>>b; ll x=a|b; ll p=1; rep(i,x){ p*=i+1; } cout<<p<<endl; } int main(){ ios_base::sync_with_stdio(false); cin.tie(NULL); solve(); return 0; }