#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main() {

	string s;
	cin >> s;

	vector<int> num(s.size()+1, 0);

	for( int i = s.size()-1; i >= 0; i-- ) {
		num[i] = int( s[i]-'0');
	}

	int cnt = 0;
	bool carry = false;
	for( int i = 0; i < num.size(); i++ ) {
		if( num[i] == 9 and carry) {
			num[i] = 0;
			carry = true;
			continue;
		}

		num[i] += carry;
		carry = false;

		if( num[i] <= 4 ) {
			cnt += num[i];
		} else if( num[i] >= 6 ) {
			cnt += (10-num[i]);
			carry = true;
		} else if( num[i] == 5 ) {
			cnt += 5;
			carry = (num[i+1] >= 5);
		}
	}

	cout << cnt << endl;


	return 0;
}