#include<bits/stdc++.h>
using namespace std;
int main(){
    int a[20]={0},i,zd=0,n;
    for(i=0;i<50;i++){
    	cin>>n;
    	a[n]++;
}

    for(i=0;i<20;i++){
	    if(zd<a[i]){
	    	zd=a[i];
	    }
    }
    cout<<zd;
}

/**************************************************************
	Problem: 1180
	User: chenmingyu
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/