import sys
import numpy as np

read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

MOD = 10**9 + 7

N, M, K = map(int, readline().split())
m = map(int, read().split())
PQC = tuple(zip(m, m, m))

dp = np.zeros((310, 310), np.int64)  # 最後の音、複雑度 -> 何通り
# 1音目
dp[1:301, 0] = 1
for _ in range(N - 1):
    newdp = np.zeros_like(dp)
    for p, q, c in PQC:
        newdp[q, c:310] += dp[p, 0:310 - c]
    dp = newdp % MOD

ans = dp[:, K].sum() % MOD
print(ans)