#include <stdio.h>
int main(){
int N;
if (scanf("%d",&N)!=EOF){
if (N<2001||N>2100){printf("Invalid year!");}
else{
int count=0;
for (int i=2001;i<=N && i<=2100;i++){
if ((i%4==0 && i%100!=0) || i%400==0){count++;printf("%d\n",i);}
}
if (count==0){printf("None");}
}
}else{
printf("input wrong");
}
return 0;
}
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