#include <stdio.h>
 
int main() {
    int num, i;
    unsigned long long factorial = 1;
 
    // Get the input from the user
    printf("Enter a number: ");
    scanf("%d", &num);
 
    // Check if the number is negative, zero, or positive
    if (num < 0) {
        printf("Factorial does not exist for negative numbers\n");
    } else {
        for (i = 1; i <= num; i++) {
            factorial *= i;
        }
        printf("The factorial of %d is %llu\n", num, factorial);
    }
 
    return 0;
}

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