/******************************************************************************
 
Welcome to GDB Online.
GDB online is an online compiler and debugger tool for C/C++.
Code, Compile, Run and Debug online from anywhere in world.
 
*******************************************************************************/
 
	#include <stdio.h>
int main() {
    int n;
    long fact = 1;
    scanf("%d", &n);
    for (int i = 1; i <= n; ++i)
        fact *= i;
    printf("%llu\n", fact);
    return 0;
}
 

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45