#include <stdio.h>
#include<windows.h>
#include <stdlib.h>
int main()
{
int n = 0;
int i = 0;
int ret = 1;
scanf("%d", &n);
for (i = 1; i <= n; i++)
{
ret = ret*i;
}
printf("%d", ret);
system("pause");
return 0;
}
#include<windows.h>
#include <stdlib.h>
int main()
{
int n = 0;
int i = 0;
int ret = 1;
scanf("%d", &n);
for (i = 1; i <= n; i++)
{
ret = ret*i;
}
printf("%d", ret);
system("pause");
return 0;
}