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- import java.util.Scanner;
- import java.math.BigDecimal;
- public class Tribonacci {
- public static void main(String[] args) {
- Scanner input=new Scanner(System.in);
- BigDecimal t1=new BigDecimal(input.nextLine());
- BigDecimal t2=new BigDecimal(input.nextLine());
- BigDecimal t3=new BigDecimal(input.nextLine());
- int n=input.nextInt();
- if(n==1){
- System.out.println(t1);
- } else if(n==2){
- System.out.println(t2);
- }else if(n==3){
- System.out.println(t3);
- }else{
- for (int i = 3; i < n; i++) {
- BigDecimal result=t1.add(t2.add(t3));
- t1= t2;
- t2=t3;
- t3=result;
- }
- System.out.println(t3);
- }
- }
- }
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