#include<stdio.h>
long long factorial(int num) {
    long long result = 1;
    for(int i= 1; i <= num; i++) {
        result *= i;
    }
    return result;
}
int main() {
    int n;
    long long total_power = 0;
    scanf("%d",&n);
    if(n <= 0 || n > 15) {
        printf("Invalid input\n");
        return 0;
    }
for(int i=1; i <= n; i++) {
    long long fact_i =factorial(i);
    if(i % 2 != 0) 
        total_power += fact_i;
        } else {
            total_power -= fact_i;
        }

 printf("the total clash pow : %lld\n",total_power);   
return 0;
}