#include <iostream> using namespace std; int main() { //input int num; while(cin>>num) { if(num == 1) { cout<<"1"<<endl; return 0; } //num != 1 int tmp = num*(num - 1)+1; for(int i=0; i<num -1; i++) { cout<<tmp<<"+"; tmp += 2; } cout << tmp <<endl; } //return return 0; }