#include <bits/stdc++.h>
using namespace std;

int main()
{
	string S;
	cin >> S;

	int N = S.size();
	int ans = 0;
	int len = 0;
	for( int i = 0; i < N - 2; i++ ) {
		int a = S[i] & 0xff;
		int b = S[i + 1] & 0xff;
		int c = S[i + 2] & 0xff;
		if( a == 0xe2 && b == 0x80 && c == 0xa6 ) {
			len++;
			i += 2;
		}
		else len = 0;
		ans = max( ans, len );
	}

	cout << ans << endl;
}