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- import java.math.BigInteger;
- import java.util.Scanner;
- public class B2 {
- final static int N = 1977;
- public static void main(String[] args) {
- BigInteger s = BigInteger.ONE;
- for (int i = 2; i <= N; i++)
- s = s.multiply(new BigInteger(String.valueOf(i)));
- System.out.println(s);
- cin.close();
- }
- static Scanner cin = new Scanner(System.in);
- }
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