#include <stdio.h>
#include <stdlib.h>

int main(void){
 int n;
 int err;

 printf("Entrer un entier naturel ");
 err= scanf("%d",&n);
 if ((n%3)<=1) {
  printf("le multiple le plus proche est : %d\n", (n /3)*3);
 } else { 
   printf("%d\n",(n/3+1)*3);
 }
 return EXIT_SUCCESS;
 } 
     
 /*