N, V, L = map(int, input().split())
inf = 10**18
dp = [inf]*(V+1)
dp[V] = 0
bx = 0
for _ in range(N):
    ndp = [inf] * (V+1)
    x, v, w = map(int, input().split())
    for vl in range(V+1):
        if vl+(x-bx) > V:
            continue
        ndp[vl] = dp[vl+(x-bx)]
    for vl in range(V, -1, -1):
        vi = min(vl+v, V)
        ndp[vi] = min(ndp[vi], ndp[vl]+w)
    dp = ndp
    bx = x
R = min(dp[L-bx:])
if R >= inf:
    print(-1)
else:
    print(R)