#include<stdio.h>
int main()
{
int i = 0;
int n = 0;
int sum = 1;
scanf("%d", &n);
if(n>=0){
for (i = 1; i <= n; i++) {
sum = sum * i;
}
}
else sum = 0;
printf("%d\n", sum);
return 0;
}
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