import java.math.BigInteger;

public class Factorial {

    public BigInteger factorialOf(Integer value){
        BigInteger factorialValue = BigInteger.valueOf(1);
        for (int i=1;i<=value;i++) {
            factorialValue = factorialValue.multiply(BigInteger.valueOf(i));
        }
        return factorialValue;
    }
    
    /* Overflow
    public String factorialOf1000(){
        int value = 1000;
        BigInteger factorialValue = new BigInteger("1");
        for (int i=1;i<=value;i++) {
            factorialValue = factorialValue.multiply(new BigInteger(i + ""));
        }
        return factorialValue.toString();
    }
    */
}