// source problem : 
#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
#define int long long
#define lb lower_bound
#define ub upper_bound
#define MASK(i) (1LL << (i))
const int inf = 1e18;
void ckmax(int& f, int s)
{
    f = (f > s ? f : s);
}
void ckmin(int& f, int s)
{
    f = (f < s ? f : s);
}
int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n, x;
    cin >> n >> x; 
    int ans = 0;
    while (n--) {
        int a, b ;
        cin >> a >> b;
        if (a > b) swap(a, b);
        if (b - a <= x) ans += b;
        else {
            int c;
            cin >> c;
            ans += c;
        }
    }   
    cout << ans;
    return 0;
}
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