import java.math.BigInteger;

//Write a program that computes the factorial n! = 1 x 2 x ... x n, 
//using BigInteger. Compute the factorial of 1000.

public class Factorial {

    public BigInteger factorialOf(Integer value){
        int i = 1;
        int j = 1;
        
        
        
        for(i = 1; i <= value; i++){
            j=j*i;
        }
        
        //j is the factorial of value
        
        BigInteger x = BigInteger.valueOf(j);
        
        return x;
    }

}