package com.javarush.task.task15.task1531;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigDecimal;
/*
Факториал
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int input = Integer.parseInt(reader.readLine());
reader.close();
if (input <= 150) {
System.out.println(factorial(input));
}
}
public static String factorial(int n) {
if (n < 0) {
System.out.println("0");
} else if (n == 0) {
System.out.println("1");
} else {
if (n == 1) {
return String.valueOf((BigDecimal.valueOf(1)));
} else {
BigDecimal result = BigDecimal.ONE;
for (int i = 1; i <= n; i++) {
result = result.multiply(BigDecimal.valueOf(i));
}
System.out.println(result.toString());
}
}
return "";
}
}
package com.javarush.task.task15.task1531;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigDecimal;
/*
Факториал
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int input = Integer.parseInt(reader.readLine());
reader.close();
if (input <= 150) {
System.out.println(factorial(input));
}
}
public static String factorial(int n) {
if (n < 0) {
System.out.println("0");
} else if (n == 0) {
System.out.println("1");
} else {
if (n == 1) {
return String.valueOf((BigDecimal.valueOf(1)));
} else {
BigDecimal result = BigDecimal.ONE;
for (int i = 1; i <= n; i++) {
result = result.multiply(BigDecimal.valueOf(i));
}
System.out.println(result.toString());
}
}
return "";
}
}