#include<iostream> #include<string> #include<iomanip> #include<cmath> #include<vector> #include<algorithm> #include<utility> using namespace std; #define int long long #define endl "\n" constexpr long long INF = (long long)1e18; constexpr long long MOD = 1'000'000'007; struct fast_io { fast_io(){ std::cin.tie(nullptr); std::ios::sync_with_stdio(false); }; } fio; signed main(){ cout<<fixed<<setprecision(10); int N, X, Y = 0; cin>>N>>X; for(int i = 0; i < N; i++){ int S; cin>>S; Y += S; } cout<<Y + X - N * X<<endl; return 0; }