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

class For_04_goukei {
	public static void main(String[] args ) throws Exception{
		
		int i;
		int end,goukei=0;
		
		BufferedReader inp=new BufferedReader
			(new InputStreamReader(System.in));
		String keybd;
		
		System.out.print("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++ ) {
			System.out.print(i);
			
			if ( i<end )
				System.out.print("＋");
			
			goukei=goukei+i;
			
		}
		System.out.print("＝"+goukei+"\n");
		
	}
}