import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {

    // METHOD 1

    public static int smallestmultiple(int X, int A, int B){
        for(int i=A;i<=B;i++){
            if(i%X==0){ 
                return i;
            }
        }
                return 0;
    }

    public static void main(String[] args) {
        
        Scanner scn = new Scanner(System.in);
        int X = scn.nextInt();
        int A = scn.nextInt();
        int B = scn.nextInt();

        int answer = smallestmultiple(X, A, B);
        System.out.println(answer);
    }
}

// ------------------------------------------------------------------------------------------------------------

    // METHOD 2
    public static void smallestmultiple(int X, int A, int B){
        for(int i=A;i<=B;i++){
            if(i%X==0){ 
                System.out.println(i);
                break;
            }
        }
    }
    
    public static void main(String[] args) {
        
        Scanner scn = new Scanner(System.in);
        int X = scn.nextInt();
        int A = scn.nextInt();
        int B = scn.nextInt();

        smallestmultiple(X, A, B);
    }
}

// ------------------------------------------------------------------------------------------------------------

    // Original unsorted array = 1, 4, 3, 5, 6, 7, 9, 8, 2, 10
    // Expected Sorted array = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

// ------------------------------------------------------------------------------------------------------------