猜生日

import java.util.Scanner;
public class GuessBirthday {
public static void main(String [] args)
{
String set1 =
"1  3  5  7\n" +
"9  11 13 15\n" +
"17 19 21 23\n" +
"25 17 29 31\n";
String set2 =
"2  3  6  7\n" +
"10 11 13 15\n" +
"18 19 20 21\n"+
"26 27 30 31\n";
String set4 =
"8  9  10 11\n" +
"12 13 14 15\n" +
"16 17 18 19\n" +
"20 21 22 23\n";
String set5 =
"16 17 18 19\n" +
"20 21 22 23\n" +
"24 25 26 27\n" +
"28 29 30 31\n";
String set3 =
"4  5  6  7\n" +
"12 13 14 15\n" +
"20 21 22 23\n" +
"28 29 30 31\n";
int day=0;
Scanner input = new Scanner(System.in);
System.out.print("Is your birthday in Set1?");
System.out.print(set1);
System.out.print("\nEnter 0 for No and 1 for Yes: ");
int answer = input.nextInt();
if(answer == 1)
day += 1;
System.out.print("\nIs your birthday in Set2?");
System.out.print(set2);
System.out.print("\nEnter 0 for No and 1 for Yes: ");
answer = input.nextInt();
if(answer == 1)
day += 2;
System.out.print("\nIs your birthday in Set3?");
System.out.print(set3);
System.out.print("\nEnter 0 for No and 1 for Yes: ");
answer = input.nextInt();
if(answer == 1)
day += 4;
System.out.print("\nIs your birthday in Set4?");
System.out.print(set4);
System.out.print("\nEnter 0 for No and 1 for Yes: ");
answer = input.nextInt();
if(answer == 1)
day += 8;
System.out.print("\nIs your birthday in Set5?");
System.out.print(set5);
System.out.print("\nEnter 0 for No and 1 for Yes: ");
answer = input.nextInt();
if(answer == 1)
day += 16;
input.close();
System.out.println("\nYour birthday is " + day + "!");

}
}