import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.NoSuchElementException;


public class Main{

	public static void main(String[] args) {
		new Main().run();
	}
	
	void run() {
		FastScanner sc=new FastScanner();
		int N=sc.nextInt();
		int V=sc.nextInt();
		int L=sc.nextInt();
		int[] x=new int[N+2];
		int[] v=new int[N+2];
		int[] w=new int[N+2];
		for (int i=0;i<N;++i) {
			x[i+1]=sc.nextInt();
			v[i+1]=sc.nextInt();
			w[i+1]=sc.nextInt();
			v[i+1]=Math.min(v[i+1], V);
		}
		x[N+1]=L;
		long[][] dp=new long[N+2][V+1];
		long INF=Long.MAX_VALUE/3;
		for (int i=0;i<dp.length;++i) {
			for (int j=0;j<dp[i].length;++j) {
				dp[i][j]=INF;
			}
		}
		dp[0][V]=0;
		for (int i=0;i<N+1;++i) {
			if (i!=0)
				for (int j=0;j<V;++j) {
					int nj=Math.min(V, j+v[i]);
					dp[i][nj]=Math.min(dp[i][nj], dp[i][j]+w[i]);
				}
			for (int j=x[i+1]-x[i];j<=V;++j) {
				int nj=j-(x[i+1]-x[i]);
				dp[i+1][nj]=Math.min(dp[i+1][nj], dp[i][j]);
			}
		}
		long ans=INF;
		for (int i=0;i<=V;++i) ans=Math.min(ans, dp[N+1][i]);
		System.out.println(ans==INF?-1:ans);
	}
	
	
	void tr(Object...objects) {System.out.println(Arrays.deepToString(objects));}
}

class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    
    public double nextDouble() { return Double.parseDouble(next());}
}