#include <bits/stdc++.h> using namespace std; using ll =long long; #define all(v) v.begin(),v.end() #define rep(i,a,b) for(int i=a;i<b;i++) #define rrep(i,a,b) for(int i=a;i>=b;i--) int main() { ll a,b;cin>>a>>b; a|=b; ll ans=1; for(ll i=1;i<=a;i++) { ans*=i; } cout<<ans<<endl; }