ABC103C.cpp

#include <iostream>
using namespace std;
int main(int argc, char const *argv[]) {
  int n;
  cin>>n;
  int sum=0;
  for(int i=0;i<n;i++){
    int tmp;
    cin>>tmp;
    sum+=tmp-1;
  }
  cout<<sum<<endl;
  return 0;
}