import java.util.*;
class Main{
  	public static void main(String[]args){
      	Scanner sc=new Scanner(System.in);
      int ans=15;
    	for(int i=0;i<5;i++)ans-=sc.nextInt();
      System.out.println(ans);
    }
}
/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