// code of JUYU ^ ^ never doubt youself !
#include <bits/stdc++.h>
typedef long long ll;
#define int ll
#define For(i,a,b) for (int i = a; i <= b; i ++)
#define Dow(i,a,b) for (int i = b; i >= a; -- i)
#define ms(a,b) memset(a, b, sizeof (a))
#define fir first
#define sec second
#define mk make_pair
#define pb push_back
#define eb emplace_back
using namespace std;
typedef pair<int,int> PII;

const int mod = 998244353;
const int MOD = 1000000007;
const int maxn = 2e5 + 5;

inline ll read()
{
  ll t = 0, dp = 1; char c = getchar();
  while(!isdigit(c)) {if (c == '-') dp = -1; c = getchar();}
  while(isdigit(c)) t = t * 10 + c - 48, c = getchar();
  return t * dp;
}
inline void write(ll x){if (x < 0){putchar('-'); x = -x;} if(x >= 10) write(x / 10); putchar(x % 10 + 48);}
inline void writeln(ll x){write(x); puts("");}
inline void write_p(ll x){write(x); putchar(' ');}
inline void write_b(ll x){putchar(' '); write(x);}

inline int count(int x)
{
  int res = 1;
  For(i,1,x) res *= i;
  return res;
}

signed main()
{
  int a = read(), b = read();
  
  writeln(count(a | b));
  
  return 0;
}

/* stuff you should look for
 * int overflow, array bounds
 * special cases (n=1?)
 * do smth instead of nothing and stay organized
 * WRITE STUFF DOWN
 * DON'T GET STUCK ON ONE APPROACH
 -- Benq
*/