n,V,l = map(int,input().split())
XVW = [list(map(int,input().split())) for i in range(n)]
inf = 10**15
dp = [inf]*(V+1)
dp[V] = 0
now = 0
for x,v,w in XVW:
    dif = x-now
    now = x
    ndp = [inf]*(V+1)
    mi = inf
    for j in range(dif,V+1)[::-1]:
        if dp[j] == inf:
            continue
        mi = min(mi,dp[j])
        ndp[j-dif] = min(ndp[j-dif],dp[j])
        ndp[min(j-dif+v,V)] = min(ndp[min(j-dif+v,V)],dp[j]+w)
    dp = ndp

dif = l-now
ans = inf
for i in range(dif,V+1):
    ans = min(ans,dp[i])
if ans == inf:
    ans = -1

print(ans)