#include <stdio.h>
void main()
{
  int i,s1,s2,n;

  printf("give me data?"); scanf("%d",&n);
  s1=s2=0;
  for (i=1; i<=n; i++) {
    if (i%2 ==0) s2+=i;
    else s1+=i;
  }
  if (n % 2 == 0) {
    printf("1+3+5+7+...+%d=%d\n",n-1,s1);
    printf("2+4+6+8+...+%d=%d\n",n,s2);
  }
  else {
    printf("1+3+5+7+...+%d=%d\n",n,s1);
    printf("2+4+6+8+...+%d=%d\n",n-1,s2);
  }
}