import java.util.*;

class Main{
public static void main(String args[]){
   Scanner sc = new Scanner(System.in);
   long n = sc.nextLong();
   long a = sc.nextLong();
   long b = sc.nextLong();
   long ret = 0;
   long rep = (long)(n/(a+b));
   ret += rep*a;
   long remain = n - (rep*(a+b));
  
   System.out.println(ret+Math.max(0,Math.min(a,remain)));
}
}
/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