sum.cpp

#include<iostream>
using namespace std;

int sum(int a,int b){
	return (a+b)*(b-a+1)/2;
}
int main(void){
	ios::sync_with_stdio(false);
	int n;
	while(cin>>n){
		int cnt=0;
		int s=1,e=1;
		while(e<n&&s<=e){
			int r=sum(s,e);
			if(r==n){
				cout<<s<<" "<<e<<endl;
				cnt++;
				s++;
			}
			else if(r>n){
				s++;
			}
			else if(r<n){
				e++;
			}
		}
		cout<<cnt<<endl;
	}
	return 0;
}