// 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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