#include <bits/stdc++.h>
#define GET_MACRO(a, b, c, NAME, ...) NAME
#define rep(...) GET_MACRO(__VA_ARGS__, rep3, rep2)(__VA_ARGS__)
#define rep2(i, a) rep3 (i, 0, a)
#define rep3(i, a, b) for (int i = (a); i < (b); i++)
#define repr(...) GET_MACRO(__VA_ARGS__, repr3, repr2)(__VA_ARGS__)
#define repr2(i, a) repr3 (i, 0, a)
#define repr3(i, a, b) for (int i = (b) - 1; i >= (a); i--)
#define chmin(a, b) ((b) < a && (a = (b), true))
#define chmax(a, b) (a < (b) && (a = (b), true))
using namespace std;
typedef long long ll;

struct edge { int v; double c; };
int N, M;
vector<edge> g[20];
double dp[1 << 20][20];

double f(int s, int k) {
	if (k == 0) return 1.0;
	if (dp[s][k] >= 0) return dp[s][k];
	double p = 1;
	for (auto e : g[k]) if (~s & 1 << e.v) {
		p *= 1.0 - f(s | 1 << e.v, e.v) * e.c;
	}
	return dp[s][k] = 1.0 - p;
}

int main() {
	cin >> N >> M;
	rep (i, M) {
		int A, B, C;
		cin >> A >> B >> C;
		g[B].push_back({A, C / 100.0});
	}
	rep (i, 1 << 20) rep (j, 20) dp[i][j] = -1;
	double ans = f(1 << N - 1, N - 1);
	printf("%.20f\n", ans);
	return 0;
}