"""
dpだろうね
N,Vが小さいので、これでdpか？

dp[i番目のgsに来た時][燃料残量] = 最小のコスト
"""

N,V,L = map(int,input().split())

dp = [[float("inf")] * (V+1) for i in range(N+2)]
dp[0][V] = 0
lastx = 0

for i in range(N+1):

    if i == N:
        x = L
        v = 0
        w = 0

    else:
        x,v,w = map(int,input().split())



    for j in range(V-(x-lastx)+1):

        dp[i+1][j] = dp[i][j+x-lastx]

    for j in range(V,-1,-1):

        dp[i+1][min(V,j+v)] = min(dp[i+1][min(V,j+v)] , dp[i+1][j] + w)

    lastx = x

ans = min(dp[-1])

if ans == float("inf"):
    print (-1)
else:
    print (ans)