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

/*int main(void) {
  int x=3;               
 
  if (x=2) {
    printf("x vaut 2\n");   
  } else {
    printf("x est different de 2\n");              
  }
 
  printf("%d\n", x);                                          
 
  if (x=0) {
    printf("x vaut 0\n");                                         
  } else {
    printf("x est different de 0\n");          
  }
 
  printf("%d\n", x);                                          
 
  return EXIT_SUCCESS;
}*/

int main(void){
  int n = 0;
  int num = 0;
  double x = 0;
  int table = 0;

  printf("Entrez un réel : ");
  n = scanf("%lf", &x);
  num = x ;
  table = num % 3;
  
  if ( table == 2){

    num = num + 1;
    printf("%d \n", num);
  }else if(table == 0){

    printf("%d \n", num);
  }else{

    num = num - 1;
    printf("%d \n", num);
  }

}