/*#include <stdio.h>int main(){ int num; scanf("%d",&num); while(num!=0) { printf("%d\n",num); num--; } return 0;}*//*#include<stdio.h>int main(){ int i,num,sum; scanf("%d",&num); sum=0; for(i=1;i<=num;i++) { if(i%2==0) sum+=i; } printf("%d",sum); return 0;}*/