import std.stdio, std.conv;
import std.algorithm, std.range, std.random;
import std.string, std.array, std.container, std.bigint;
import std.typecons;


int main() {
	int n, m;
	readf("%d %d\n", &n, &m);

	alias E = Tuple!(int, int, double);
	E[] g;

	foreach (i; 0..m) {
		int a, b; double c;
		readf("%d %d %f\n", &a, &b, &c);
		g ~= tuple(a, b, c);
	}
	double[] res = new double[](n);
	bool[] used = new bool[](n);
	res[0] = 1; used[0] = true;
	foreach (_ ; 0..2*n) {
		foreach (i; 0..n) {
			if (used[i]) continue;
			bool f = true;
			double sm = 1;
			foreach (e; g) {
				if (e[1] != i) continue;
				if (used[e[0]] == false) {
					f = false;
					break;
				}
				sm *= (1 - res[e[0]]*e[2] / 100.0);
			}
			if (!f) continue;
			res[i] = 1-sm;
			used[i] = true;
		}
	}
	if (used[n-1]) {
		writef("%.20f\n", res[n-1]);
	} else {
		writeln(0);
	}
	return 0;
}