N = 10**6
mod = 10**9+7
fac = [1]*(N+1)
finv = [1]*(N+1)
for i in range(N):
    fac[i+1] = fac[i] * (i+1) % mod
finv[-1] = pow(fac[-1], mod-2, mod)
for i in reversed(range(N)):
    finv[i] = finv[i+1] * (i+1) % mod

def cmb1(n, r):
    if r <0 or r > n:
        return 0
    r = min(r, n-r)
    return fac[n] * finv[r] * finv[n-r] % mod

from collections import defaultdict

gx, gy, k = map(int, input().split())
XYN = []
for i in range(k):
    x,y,n = map(int, input().split())
    XYN.append((x, y, n))

dp = defaultdict(lambda: 0)
dp[(0, 0, 0)] = 1
for i, (x, y, n) in enumerate(XYN):
    nx = defaultdict(lambda: 0)
    for a in range(0, n+1):
        for (cx, cy, s), v in dp.items():
            if abs(cx-gx) > 10**4*(k-i) or abs(cy-gy) > 10**4*(k-i):
                continue
            ncx, ncy = cx+a*x, cy+a*y
            ns = s+a
            nx[(ncx,ncy,ns)] += v*cmb1(ns,a)
            nx[(ncx,ncy,ns)] %= mod
    dp = nx

ans = 0
for (cx, cy, s), v in dp.items():
    if cx == gx and cy == gy:
        ans += v
        ans %= mod
print(ans)