public static void extraLongFactorials(int n) {
        BigInteger factorial = calculateFactorial(n);
        System.out.println(factorial);
    }

    public static BigInteger calculateFactorial(int n){
        BigInteger result = BigInteger.ONE;
        for(int i = 2; i <= n; i++){
            result = result.multiply(BigInteger.valueOf(i));
        }
        return result;
    }

def extraLongFactorials(n):
    # Write your code here
    result=1
    for i in range(n):
        result*=(i+1)
    print(result)

def extraLongFactorials(n):
    # Write your code here
    if n == 1:
        return 1
    return n * extraLongFactorials(n-1)

function strMultiply(a,b){
    const strA = String(a).split("").reverse().join(''); //i
    const strB = String(b).split("").reverse().join(''); // j
    const result = new Array(strA.length + strB.length).fill(0);
    
    
    for(let i=0 ;i<strA.length;i++){
        for(let j=0;j<strB.length;j++){
            const mult = +strA[i] * +strB[j];
            const sum = result[i+j] + mult
            result[i+j] = sum % 10;
            result[i+j + 1] += Math.floor(sum/10) 
       }
        
    }
    
    while(result[result.length -1]===0){
        result.pop()
    }
    
    return result.reverse().join("")
}