#include<bits/stdc++.h>
using namespace std;
int main(){
	int a[19]={0},n,i,d[49]={0},b;
	for(i=0;i<=49;i++){
        cin>>d[i];
	}
	for(i=0;i<50;i++){
	    a[d[i]]++;              	
	}
	b=a[0];
	for(i=0;i<=19;i++){	
        if(b<a[i]){
        	b=a[i];
        }
	}
	cout<<b;


}

/**************************************************************
	Problem: 1180
	User: wngjinming
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/