#include<stdio.h>
long long factorial(int num){
    long long result = 1;
    for(in i = 1;i <= num; i++){
        result *= i;
    }
    return result;
}
int main() {
    int n;
    long long total_power = 0;
    printf("enter a number n(1<=n<15): ");
    scanf("%d",&n);
    if(n<=0 || n>=15){
        printf("Invalid input\n");
        return 1;
    }
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 power is :%lld\n",total_power);   
return 0;
}