#include<stdio.h>
int a[20]; 
int main() 
{
    int i,x;
    for(i = 1;i <= 50;i++)
	{
	    scanf("%d",&x);
	    a[x]++;
	}
	int max=a[0];
	for(i=0;i<=19;i++)
	{
		if(a[i]>max)
		{
			max=a[i];
		}
	}
	printf("%d",max);
}
/**************************************************************
	Problem: 1180
	User: admin
	Language: C
	Result: Accepted
	Time:10 ms
	Memory:1144 kb
****************************************************************/