#include<stdio.h>
int main(){
int year,leap;
while(scanf("%d",&year)!=EOF){
if(year%4==0){
if(year%100){
if(year%400)leap=1;
else leap=0;
}
else leap=1;
}
else leap=0;
if(leap==1) printf("%d is",year);
else printf("%d is not",year);
}
return 0;
}