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

class For_04_goukei{
	public static void main(String[] args) throws Exception {
		
		int i,goukei;
		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");
	}
}