/*
---------------------------------------------
	for文　１からのｎまでの合計	For_04_goukei
---------------------------------------------
*/
import java.io.*;

class For_04_goukei {
	public static void main(String[] args) throws Exception {
		
		BufferedReader inp = new BufferedReader
			(new InputStreamReader(System.in));
		String keybd;

		int i,end,goukei;
		
		goukei=0;
		
		System.out.print("\nいくつまでの合計を求めますか\n");
		System.out.print("END  --->");
		keybd=inp.readLine();
		end=Integer.parseInt(keybd);

		for ( i=1 ; i<=end ; i+=1 ) {
			
			System.out.print(i);
			
			if ( i<end )
				System.out.print("＋");

			goukei+=i;
		
		}
		
		System.out.print("＝");
		System.out.print(goukei);
		System.out.print("\n");
		
	}
}