import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long N = scanner.nextLong();
        long A = scanner.nextLong();
        long B = scanner.nextLong();
        if(A==0){
            System.out.println(0);
            return;
        }
        long num = N/(A+B);
        long rem = N - num*(A+B);
        long remB = rem>=A?A:rem;
        System.out.println(num * A + remB);
    }

}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz