#include <bits/stdc++.h>

using namespace std;

int32_t main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    unsigned long long n;
    cin >> n;
    auto s = bitset<128>(n);
    unsigned long long ans = 0;
    unsigned long long now = 1;
    bool fnd = s[s.size() - 1] == true;
    for(int i = s.size() - 2; i >= 0; i--){
        if(fnd == s[i]){
            fnd = !fnd;
            now++;
        }
        else {
            ans = max(ans, now);
            now = 1;
            fnd = s[i] != true;
        }
    }
    ans = max(ans, now);
    cout << ans;
}