// NOTE: it is recommended to use this even if you don't understand the following code.

#include <fstream>
#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main() {
    // uncomment the two following lines if you want to read/write from files
    // ifstream cin("input.txt");
    // ofstream cout("output.txt");

    int N,ans=0;
    cin >> N;

    vector<int> C(N);
    for (int i = 0; i < N; ++i){
        cin >> C[i];
        if(C[i]>0) --C[i];
        ans += C[i];
    }


    


    // INSERT YOUR CODE HERE


    cout << ans << endl;

    return 0;
}