#include <algorithm> #include <cassert> #include <cstdio> #include <cmath> #include <deque> #include <iostream> #include <map> #include <unordered_set> #include <unordered_map> #include <vector> #include <set> using namespace::std; int main() { ios::sync_with_stdio(false); int n; cin >> n; int a; for (int i = 0; i < n; ++i) { cin >> a; } cout << a - n << endl; return 0; }