#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,m=0,i;
    int a[20]={};
    for(i=0;i<50;i++){
        cin>>n;
        a[n]++;
    } 
    for(i=0;i<20;i++){
        if(a[i]>m){
            m=a[i];
        }
    }
    cout<<m;
}
/**************************************************************
	Problem: 1180
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/