#include <bits/stdc++.h>
using namespace std;
#define int long long
const int maxn = 1e5 + 7, sum = 1e5 + 7;
const int mod = 1e9 + 7;
int dp[maxn];
signed main() {
ios::sync_with_stdio(false);
cin.tie(0);
int n,q;
cin >> n ;
cin >> q;
int cnt = 0;
vector<int>a(q + 1);
for(int i = 1; i <= q; i ++){
cin >> a[i];
}
for(int i = 1; i <= q;i ++){
cnt += a[i];
}
cout << max(0LL,cnt - 1);
}
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