def factorial(n): 
    if n < 0: 
        return 0
    elif n == 0 or n == 1: 
        return 1
    else: 
        fact = 1
        while(n > 1): 
            fact *= n 
            n -= 1
        return fact 
  
# Driver Code 
num = 5; 
print("Factorial of",num,"is", 
factorial(num))