#include<stdio.h>
main()
{unsigned int year,leap;
for(year=2000;year<=2005;year++)
{if(year%400==0)
leap=1;
else
{if(year%4==0&&year%100!=0)
leap=1;
else leap=0;}
if(leap==1)printf("%d:is a leap year.",year);
else printf("%d is not a leap year.",year); }}