"""
name: Nicholas Tamassia

Honor Code and Acknowledgments:

        This work complies with the JMU Honor Code.

       Comments here on your code and submission.
"""

import math
from collections import defaultdict


def find_arbitrage(graph: dict[str, dict[str, float]]) -> list[str] | None:
    weights: dict[str, float] = {c: math.inf for c in graph}
    prev: dict[str, str | None] = {c: None for c in graph}
    start: str = list(graph.keys())[0]

    weights[start] = 0
    for _ in range(len(graph) - 1):
        for src in graph:
            for dest, rate in graph[src].items():
                weight: float = -math.log(rate)
                if weights[src] + weight < weights[dest]:
                    weights[dest] = weights[src] + weight
                    prev[dest] = src

    node: str | None = None
    for src in graph:
        for dest, rate in graph[src].items():
            weight: float = -math.log(rate)
            if weights[src] + weight < weights[dest]:
                node = dest
                prev[dest] = src
                break
        if node is not None:
            break

    if node is None:
        return

    for _ in range(len(graph)):
        node = prev[node]

    path = [node]
    while True:
        node = prev[node]
        path.append(node)
        if node == path[0]:
            break

    path.reverse()

    return path


def main():
    n: int = int(input().strip())
    graph: dict[str, dict[str, float]] = defaultdict(dict)

    for _ in range(n):
        vals: list[str] = input().strip().split()
        src: str = vals[0]
        dest: str = vals[1]
        rate: float = float(vals[2])
        graph[src][dest] = rate

    path = find_arbitrage(graph)
    if path is not None:
        print("Arbitrage Detected")
        print(" => ".join(path))

        factor = 1.0
        for i in range(len(path) - 1):
            factor *= graph[path[i]][path[i + 1]]
        print(f"{factor:.5f} factor increase")
    else:
        print("No Arbitrage Detected")


if __name__ == "__main__":
    main()