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- import java.math.BigInteger;
- import java.util.Scanner;
- public class Tribonacci {
- public static void main(String[] args) {
- Scanner sc = new Scanner(System.in);
- BigInteger a = sc.nextBigInteger();
- BigInteger b = sc.nextBigInteger();
- BigInteger c = sc.nextBigInteger();
- int n = sc.nextInt();
- BigInteger tribNumber = BigInteger.valueOf(0);
- if (n==1) {
- System.out.println(a);
- } else if (n==2) {
- System.out.println(b);
- } else if (n==3) {
- System.out.println(c);
- } else{
- for (int i = 3; i < n; i++) {
- tribNumber = a.add(b).add(c);
- a = b;
- b = c;
- c = tribNumber;
- }
- System.out.println(tribNumber);
- }
- }
- }
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