#include <bits/stdc++.h>

using namespace std;

#define INF 2000000000
#define MOD 1000000007
typedef long long ll;
typedef pair<int, int> P;


int main()
{
	int a = 55;
	for (int i = 0; i < 9; i++) {
		int tmp;
		cin >> tmp;
		a -= tmp;
	}
	cout << a << endl;

}