#include "bits/stdc++.h" using namespace std; #define intt long long #define fi first #define se second const intt mxN = 1e5+1; const intt LG = 20; const intt inf = 1e18; intt n, x; void _() { cin >> n >> x; intt ans = 0; for(intt i = 0; i < n; i++) { intt a, b; cin >> a >> b; if(abs(a - b) <= x) { ans += max(a, b); } else { intt c; cin >> c; ans += c; } } cout << ans << endl; } int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); // freopen("checklist.in", "r", stdin); // freopen("checklist.out", "w", stdout); intt t = 1, buu = 1; // cin >> t; while(t--){ // cout << "Case #" << buu++ << ": "; _(); } }