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