/*
-------------------------------------------------------
	for文 1からｎまでの合計 for_04_goukei
-------------------------------------------------------
*/

#include <stdio.h>

main()
{
	int i,goukei,end;

	goukei = 0;
	
	printf("いくつまでの合計を求めますか\n");
	printf("END --> ");
	scanf("%d",&end);
	
	
	for ( i=1 ; i<=end ; i+=1 )	{
		printf("%d",i);
		
		if ( i != end )
			printf(" + ");

		goukei = goukei + i;
	}
	
	printf(" ＝ %d \n",goukei);
	
}