#include <iostream>
#include <cstdio>
using namespace std;
int main() {
long long int a,b,sum=0;
long long int fact=1;
while(cin >> a)
{
cin >> b;
while(a)
{
fact*=a;
a--;
}
sum+=fact;
fact=1;
while(b)
{
fact*=b;
b--;
}
sum+=fact;
fact=1;
printf("%lld\n",sum);
sum=0;
}
return 0;
}
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