import java.io.*;
import java.util.*;
public class MiniDWITE {
    public static void main(String[] args) throws Exception {
        File file = new File ("DATA2.txt");
        BufferedReader reader = new BufferedReader (new FileReader (file));
        FileOutputStream fileHandle = new FileOutputStream ("OUT2.txt");
        PrintWriter writer = new PrintWriter (fileHandle);
        String text = null;
        int line = 0;
        int count = 0;
        int [] ans = new int [5];
        int [] ar = new int [15];
        int fin = 0;
        while ((text = reader.readLine()) != null){
        	if (line == 0){
        		ar[line] = Integer.parseInt(text.substring(0,1));
        		ar[line+1] = Integer.parseInt (text.substring(2,3));
        		ans[count] = ar[line] + ar[line+1];
        		line ++;
        	}
        	else if (line == 1){
        		ar[line+1] = Integer.parseInt(text.substring(0,1));
        		ar[line+2] = Integer.parseInt (text.substring(2,3));
        		ans[count] = ar[line+1] + ar[line+2];
        		line ++;
        	}
        	else if (line == 2){
        		ar[line+2] = Integer.parseInt(text.substring(0,1));
        		ar[line+3] = Integer.parseInt (text.substring(2,3));
        		ans[count] = ar[line+2] + ar[line+3];
        		line ++;
        	}
        	else if (line == 3){
        		ar[line+3] = Integer.parseInt(text.substring(0,1));
        		ar[line+4] = Integer.parseInt (text.substring(2,3));
        		ans[count] = ar[line+3] + ar[line+4];
        		line ++;
        	}
        	else if (line == 4){
        		ar[line+4] = Integer.parseInt(text.substring(0,1));
        		ar[line+5] = Integer.parseInt (text.substring(2,3));
        		ans[count] = ar[line+4] + ar[line+5];
        		line ++;
        	}
        	else if (line== 5){
        		ar[line+5] = Integer.parseInt(text);
        		if (ans[line-5] == ar[line+5]){
        			fin++;
        		}
        		line++;
        	}
        	else if (line== 6){
        		ar[line+5] = Integer.parseInt(text);
        		if (ans[line-5] == ar[line+5]){
        			fin++;
        		}
        		line++;
        	}
        	else if (line== 7){
        		ar[line+5] = Integer.parseInt(text);
        		if (ans[line-5] == ar[line+5]){
        			fin++;
        		}
        		line++;
        	}
        	else if (line== 8){
        		ar[line+5] = Integer.parseInt(text);
        		if (ans[line-5] == ar[line+5]){
        			fin++;
        		}
        		line++;
        	}
        	else if (line == 9){
        		ar[line+5] = Integer.parseInt(text);
        		if (ans[line-5] == ar[line+5]){
        			fin++;
        		}
        		line++;
        		writer.println(fin);
        		line = 0;
        		count = -1;
        		fin = 0;
        	}
        	count++;
        }

        writer.close();
    }
}