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

cx = 0
d = {}
d[V] = 0
for _ in range(N):
    x, v, w = map(int, input().split())
    nd = {}
    for k in d:
        t = k - (x - cx)
        if t < 0:
            continue
        if t not in nd or nd[t] > d[k]:
            nd[t] = d[k]
        t = min(t + v, V)
        if t not in nd or nd[t] > d[k] + w:
            nd[t] = d[k] + w
    if len(nd) == 0:
        print(-1)
        exit()
    d = nd
    cx = x

result = float('inf')
for k in d:
    if k - (L - cx) >= 0:
        result = min(result, d[k])
print(result)