K

#include<iostream>

int main()
{
    int count;
    std::cin>>count;
    count=abs(count);
    double* massive=new double[count];
    for (int index{0}; index<count; ++index) {
        std::cin>>massive[index];
    }
    double max;
    if(massive[0]<0){max=massive[0]*-1;}
    else{max=massive[0];}
    for (int index{1}; index<count; ++index) {
        if(massive[index]<0){if(massive[index]*-1>max){max=massive[index]*-1;}}
        else{if(massive[index]>max){max=massive[index];}}
    }
    std::cout<<max;

}