#include<bits/stdc++.h>
using namespace std;
int main(){
	int i,b=0,a[20]={0},n;
	for(i=1;i<=50;i++){
		cin>>b;
		a[b]=a[b]+1;
	}
	n=a[0];
	 for(i=0;i<20;i++){
	 	if(n<a[i]){
	 		n=a[i];
	 	}
	 }
	 cout<<n;
}
/**************************************************************
	Problem: 1180
	User: huxuanchen
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/