#include<stdio.h>
int main()
{
int a,b,n=1;
for(a=1;a<=b;a++)
n=n*a;
return 0;
}
I2luY2x1ZGU8c3RkaW8uaD4KaW50IG1haW4oKQp7CiAgICBpbnQgYSxiLG49MTsKICAgIHNjYW5mKCIlZCIsJmIpOwogICAgZm9yKGE9MTthPD1iO2ErKykKICAgICAgICBuPW4qYTsKICAgIHByaW50ZigiJWQiLG4pOwogICAgcmV0dXJuIDA7Cn0=