print(__import__('math').factorial(int(input())) )

n = int(input())

fact = 1
while n > 1:
    fact *= n
    n -= 1

print(fact)

def factorial(x):
    if x == 1:
        return 1
    else:
        return x * factorial(x-1)
        
print(factorial(int(input())))

#include<iostream>

int factorial(int n){
    if(n==1){return n;}
    return factorial(n-1)*n;
}

int main(){
    int n;
    std::cin>>n;
    std::cout<<factorial(n);
    return 0;
}

print([1,1,2,6,24,120,720,5040,40320,362880,3628800][int(input())])