#include<bits/stdc++.h>
using namespace std;
int main(){
  int i,max=0,b[50]={0};
  int a[20]={0};
  for(i=1;i<=50;i++){
  cin>>b[i-1];
  a[b[i-1]]++;
}
  max=a[0];
  for(i=0;i<19;i++) 
  if(a[i+1]>max) max=a[i+1];
  cout<<max;
  return 0;
}
/**************************************************************
	Problem: 1180
	User: wtq001
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/