#include <iostream> /* File: construction-destruction-order.cpp */
using namespace std;


int main(){
	int k=0;
	int max=0;
	int min=0;
	double sum=0;
	int temp=0;
	int ntemp=0;
	bool changed= false;
	do{
		cout<<"please input a number k"<<endl;
		cin>>k;
	}while(k<=0);
	cout<<"the number of positive integers is "<<k<<endl;
	cout<<"please input "<<k<<" strictly increasing positive integers"<<endl;
	int i=k;
	while(i>0){
		cin>>ntemp;
		if(ntemp<0){
			while(i-1>0){
				cin>>ntemp;
				i--;
			}
			cout<<"please input the positive integers"<<endl;
			return 0;
		}
		if(ntemp<temp){
			cout<<"please input strictly increasing positive integers"<<endl;
			cout<<"please input: "<<endl;
			cin>>ntemp;
			while(ntemp<temp){
				cout<<"please input again:"<<endl;
				cout<<"please input: "<<endl;
				cin>>ntemp;
			}
			changed = true;
		}
		temp=ntemp;
		if(temp>max||i==k){
			max=temp;
		}
		if(temp<min||i==k){
			min=temp;
		}
		sum+=temp;
		i--;
	}
	double avg = sum/k;
	if(changed){
	    cout<<"after changing, input increasing ok"<<endl;
	}
	else{
		cout<<"total input increasing ok"<<endl;
	}
	cout<<"min: "<<min<<" max:"<<max<<" average: "<<avg<<endl;
	return 0;

}