Помогите, что не так с кодом?

package calc;
//import java.lang.String;
import java.util.Scanner;

public class Main {

public static void main(String[] args) {
// write your code here
Scanner wd = new Scanner(System.in);
System.out.print("Enter what do (1 - +; 2 - -; 3 - /; 4 - *): ");
int wd_1;
wd_1 = wd.nextInt();
for (wd_1 = 1) {
Scanner num = new Scanner(System.in);
int first, second, result;
System.out.println("----------------------------");
System.out.print("Enter first number: ");
first = num.nextInt();
System.out.print("Enter second number: ");
second = num.nextInt();
result = first + second;
System.out.println("----------------------------");
System.out.print("Result is: " + result);
}
for (wd_1 = 2) {
Scanner num = new Scanner(System.in);
int first2, second2, result2;
System.out.println("----------------------------");
System.out.print("Enter first number: ");
first2 = num.nextInt();
System.out.print("Enter second number: ");
second2 = num.nextInt();
result2 = first2 - second2;
System.out.println("----------------------------");
System.out.print("Result is: " + result2);
}
for(wd_1 = 3) {
Scanner num = new Scanner(System.in);
int first3, second3, result3;
System.out.println("----------------------------");
System.out.print("Enter first number: ");
first3 = num.nextInt();
System.out.print("Enter second number: ");
second3 = num.nextInt();
result3 = first3 / second3;
System.out.println("----------------------------");
System.out.print("Result is: " + result3);
}
for(wd_1 = 4) {
Scanner num = new Scanner(System.in);
int first4, second4, result4;
System.out.println("----------------------------");
System.out.print("Enter first number: ");
first4 = num.nextInt();
System.out.print("Enter second number: ");
second4 = num.nextInt();
result4 = first4 * second4;
System.out.println("----------------------------");
System.out.print("Result is: " + result4);
}

}
}

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Компилятор выдает целый букет ошибок, типо отсувствует ; на строке 13 (первый цикл), и т. д. Хотя в теории все вродь верно. Что не так?