#include <stdio.h>
#include<stdbool.h>
int main() {
   int year;//2020//2021
   scanf("%d\n",&year);
   if ((year % 4== 0&&year%100!=0)|| (year % 400 == 0)) {
       printf("%d\n",year);//2020
   }
   else {
       year++;//2020//2023//2024
       while (true){
           if ((year % 4== 0&&year%100!=0)|| (year % 400 == 0)) {
               printf("%d\n",year);//2024
               break;
       }
       return 0;