# include <stdio.h>
# include <stdlib.h>
long long factorial( int n ) {
if ( n == 0 )
return 1LL;
else
return factorial( n - 1 ) * n;
}
int main() {
int n, m;
printf( "n: " );
scanf( "%d", &n );
printf( "m: " );
scanf( "%d", &m );
printf( "%lld", factorial( n ) + factorial( m ) );
return 0;
}