import java.util.*;
class Main{
     public static void main(String[] args) {
         Scanner sc=new Scanner(System.in);
         int x1=sc.nextInt();
         int x2=sc.nextInt();
         int x3=sc.nextInt();
         int x4=sc.nextInt();
         int x5=sc.nextInt();
         System.out.println(15-(x1+x2+x3+x4+x5));
     }
    
}
/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