import java.util.Scanner;

/*  --------------------------------------
  	For_04　1からｎまでの合計
   ---------------------------------------  */
public class For_04_goukei {

	public static void main(String[] args) {
		
		Scanner sc=new Scanner(System.in);
		
		int i;
		int end;
		int goukei=0;
				
		System.out.print("いくつまでの合計を求めますか\n");
		
		System.out.print("end  -->");
		end = sc.nextInt();
		
		for ( i=1 ; i<=end ; i=i+1 ) {
			
			System.out.print(i);
		
			if ( i < end )
				System.out.print("＋");
			
			goukei=goukei+i;
		}
		
		System.out.print("＝"+goukei);
		
	}
}