171221_2010_플러그

//https://www.acmicpc.net/problem/2010 #include <iostream>

using namespace std;

int main()

{

int n;

cin >> n;

int sum=0;

for(int i=0; i<n; i++)

{

int x;

cin >> x;

sum+=x;

}

cout << sum-n+1 ;

}