#include "bits/stdc++.h"
using namespace std;

#define REP(i, n) for(int i=0; i<(n); i++)
struct P { int x, y; P(){}; P(int _x, int _y): x(_x), y(_y){}; };

int N,M,A,B,C;
map<int, vector<P> > MAP;
double dfs(int n) {
    if (n == 0) return 1.0;
    double fail = 1.0;
    for (auto&& p: MAP[n]) {
        fail *= 1.0 - dfs(p.x) * p.y / 100.0;
    }
    return 1 - fail;
}
signed main()
{
    cin >> N >> M;
    vector<double> Q(N, 0.0);
    Q[0] = 1.0;
    REP(i,M) {
        cin >> A >> B >> C;
        P p = P(A, C);
        MAP[B].push_back(p);
    }
    printf("%.14f\n", dfs(N-1));
    return 0;
}