#include <iostream>

using namespace std;

int main()
{
    int num;
    int currentSum = 0;
    const int targetSum = 55;

    for (int i = 0; i < 9; ++i)
    {
        if (cin >> num)
        {
            currentSum += num;
        }
    }
    cout << targetSum - currentSum << endl;

    return 0;
}