import java.math.BigInteger;

public class Factorial {

    public BigInteger factorialOf(Integer value){
        BigInteger answer = new BigInteger("1");
        BigInteger big = BigInteger.valueOf(value.intValue());
        value = big.intValue();
        int x = big.intValue();
        for ( x = 1; x <= value; x++){

            answer = answer.multiply(BigInteger.valueOf(x)); 

        }
        return answer;
    }
}