#include <stdio.h>
int main(void) {
// your code goes here
int s=1,i=1,n;
while(i<=n)
{s=s*i;
i++;}
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CgppbnQgbWFpbih2b2lkKSB7CiAgICAvLyB5b3VyIGNvZGUgZ29lcyBoZXJlCiAgICBpbnQgcz0xLGk9MSxuOwogICAgc2NhbmYoIiVkIiwmbik7CiAgICAgICAgICB3aGlsZShpPD1uKQogICAgICAgICAge3M9cyppOwogICAgICAgICAgaSsrO30gCiAgICAgICAgICBwcmludGYoInM9JWRcbiIscyk7IAogICAgcmV0dXJuIDA7Cn0KCg==