# coding: utf-8
# Here your code !

# -*- coding: utf-8 -*-
"""
Created on Sun Sep 25 16:13:19 2016

@author: dotha
"""


def red(ll):
    j = 1
    for l in ll:
        j *= (1-l)
    return 1 - j


def counter(to):
    if to == 0:
        return 1
    else:
        return red([counter(t[0])*t[2]*0.01 for t in table if t[1]==to])


if __name__ == '__main__':
    N,M = input().split()
    N=int(N)
    M=int(M)
    
    table=[list(map(int,input().split())) for i in range(M)]
    
    print(red([counter(t[0])*t[2]*0.01 for t in table if t[1]==N-1]))