N, V, L = map(int, input().split())
gas = [list(map(int, input().split())) for _ in range(N)]

dp = [[float('inf')]*(V+1) for _ in range(N+1)]
dp[0][-1] = 0
posi = 0
for i in range(1,N+1):
    x, v, w = gas[i-1]
    use = x-posi
    for j in range(V,-1,-1):
        if j-use>=0:
            dp[i][j-use] = min(dp[i][j-use],dp[i-1][j])
            dp[i][min(V,j-use+v)] = min(dp[i][min(V,j-use+v)],dp[i-1][j]+w)
    posi = x
res = float('inf')
if L-posi>V:
    print(-1)
else:
    for i in range(L-posi,V+1):
        res = min(res, dp[-1][i])
    print(-1 if res==float('inf') else res)