[백준2292]벌집

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#pragma warning(disable:4996)

#include <stdio.h>



int main() {

 

 int num;

 int Max_round = 7;

 int count = 1;

 scanf("%d",&num);

 if(num == 1){

  printf("1");

  return 0;

  }

 else{

  while (1) {

   if (num > Max_round) {

    count += 1;

    Max_round += 6*count;

    continue;

   }

   else

    printf("%d\n",count+1); break;

  }

 }



 return 0;

}

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