import sys

sys.setrecursionlimit(200005)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.buffer.readline())
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def LI1(): return list(map(int1, sys.stdin.buffer.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def BI(): return sys.stdin.buffer.readline().rstrip()
def SI(): return sys.stdin.buffer.readline().rstrip().decode()
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
dij = [(0, 1), (1, 0), (1, 1), (1, -1)]
inf = 10**16
# md = 998244353
md = 10**9+7

n, V, l = LI()
xx, vv, ww = [], [], []
for _ in range(n):
    x, v, w = LI()
    xx.append(x)
    vv.append(v)
    ww.append(w)
xx.append(l)
dp = [inf]*(V+1)
if V-xx[0]<0:
    print(-1)
    exit()
dp[V-xx[0]] = 0

def chmin(j, val):
    if val < ndp[j]: ndp[j] = val

for i in range(n):
    ndp = [inf]*(V+1)
    d = xx[i+1]-xx[i]
    for j in range(V+1):
        pre = dp[j]
        if pre == inf: continue
        if j-d >= 0: chmin(j-d, pre)
        nj = min(V, j+vv[i])-d
        if nj >= 0: chmin(min(V, j+vv[i])-d, pre+ww[i])
    dp = ndp

ans=min(dp)
if ans==inf:ans=-1
print(ans)