import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int D = sc.nextInt();
        int a=N;
        int b=D;
        while(b!=0){
            int t=a%b;
            a=b;
            b=t;
        }
        int r=N/a-1;
        System.out.println(r);
    }
}