import sys
input = sys.stdin.readline

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

G=[list(map(int,input().split())) for i in range(N)]

if G[-1][0]!=L:
    G.append([L,0,0])

DP=[0]*(V+1)
now=0

for x,v,w in G:
    NDP=[1<<60]*(V+1)

    for i in range(V+1):
        money=DP[i]
        if i-(x-now)>=0:
            NDP[i-(x-now)]=min(money,NDP[i-(x-now)])
            NDP[min(V,i-(x-now)+v)]=min(NDP[min(V,i-(x-now)+v)],money+w)

    DP=NDP

    #print(DP)
    now=x

#print(DP)

MIN=min(DP)

if MIN>=(1<<60):
    print(-1)
else:
    print(MIN)