#include <iostream>
#include <vector>
#include <algorithm>
#include <fstream>
using namespace std;

int findMaxElement(vector<int> ar) {
    int maxEl = *max_element(ar.begin(), ar.end());
    return maxEl;
}
float findMaxElement(vector<float> ar) {
    float maxEl = *max_element(ar.begin(), ar.end());
    return maxEl;
}
double findMaxElement(vector<double> ar) {
    double maxEl = *max_element(ar.begin(), ar.end());
    return maxEl;
}
int main() {
    ofstream out_file;
    ifstream in_file;

    string ofile, ifile;
    cout << "Enter source file directory. Example: \"C:\\file.txt\"\n";
    cin >> ifile;

    in_file.open(ifile, ifstream::in);
    if (!in_file.is_open())
    {
        cout << "No such file directory";
        return -1;
    }

    cout << "Enter destiny file directory. Example: \"C:\\file.txt\"\n";
    cin >> ofile;

    out_file.open(ofile, ifstream::out);
    if (!out_file.is_open())
    {
        cout << "No such file directory";
        return -1;
    }

    vector<double> data;
    double temp;
    while ((in_file >> temp))
        data.push_back(temp);

    double ans = findMaxElement(data);
    out_file << ans;

    out_file.close(); in_file.close();
}