import java.io.*;
import java.util.*;
import java.util.stream.*;

// 処理
class Process {
    private int[] B;

    Process(int[] B) {
        this.B = B;
    }

    int getResult() {
        // 1 から 10 までの和
        int sumOfOneToTen = 55;

        return (sumOfOneToTen - IntStream.of(B).sum());
    }
}

public class Main {
    public static void main(String[] args) throws IOException {
        var bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        var printWriter    = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));

        // 入力
        int[] B = Stream.of(bufferedReader.readLine().trim().split("[ ]+")).mapToInt(Integer::parseInt).toArray();

        // 出力
        printWriter.println((new Process(B)).getResult());

        bufferedReader.close();
        printWriter.close();
    }
}