#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<ll,ll> P;
#define yn {puts("YES");}else{puts("NO");}
#define MAX_N 200005

int main() {
    ll n, m, l;
    cin >> n >> m >> l;
    ll x[n+2] = {}, v[n+2] = {}, w[n+2] = {};
    x[n+1] = l;
    srep(i,1,n+1)cin >> x[i] >> v[i] >> w[i];
    ll dp[n+2][m+1];
    ll INF = 1001001001001001001;
    rep(i,n+2)rep(j,m+1)dp[i][j] = INF;
    dp[0][m] = 0;
    
    rep(i,n+1){
        int d = x[i+1] - x[i];
        rep(j,m+1){
            if(j < d)continue;
            dp[i+1][j-d] = min(dp[i+1][j-d], dp[i][j]);
            int nv = min(m, j-d+v[i+1]);
            dp[i+1][nv] = min(dp[i+1][nv], dp[i][j] + w[i+1]);
        }
    }

    ll ans = INF;
    rep(j,m+1)ans = min(ans, dp[n+1][j]);

    if(ans == INF)ans = -1;
    cout << ans << endl;
    return 0;
}