n, m = map(int, input().split())
edges = [[] for _ in range(n)]
for _ in range(m):
    a, b, c = map(int, input().split())
    edges[b].append((a, c))

p = [0.0] * n
p[0] = 1.0

epsilon = 1e-9
max_iter = 100000

for _ in range(max_iter):
    p_new = [0.0] * n
    p_new[0] = 1.0
    for j in range(1, n):
        product = 1.0
        for (a, c) in edges[j]:
            term = 1.0 - p[a] * (c / 100.0)
            product *= term
        p_new[j] = 1.0 - product
    max_diff = 0.0
    for j in range(n):
        diff = abs(p[j] - p_new[j])
        if diff > max_diff:
            max_diff = diff
    if max_diff < epsilon:
        p = p_new
        break
    else:
        p = p_new.copy()

print("{0:.10f}".format(p[n-1]))