n = int(input())
s = input()
print(s.index('0')+1 if '0' in s else n)#include<bits/stdc++.h>
#include<string>
using namespace std;
int main()
{
int n;
cin >> n;
string s;
cin >> s;
int i;
for ( i = 0 ; i < n ; i++)
{
if (s.at(i)=='0')
{
cout << i + 1;
return 0;
}
}
cout << i;
}867A - Between the Offices | 1569A - Balanced Substring |
260A - Adding Digits | 1698C - 3SUM Closure |
1029B - Creating the Contest | 1421A - XORwice |
1029A - Many Equal Substrings | 1675D - Vertical Paths |
1271C - Shawarma Tent | 805A - Fake NP |
1163A - Eating Soup | 787A - The Monster |
807A - Is it rated | 1096A - Find Divisible |
1430C - Numbers on Whiteboard | 1697B - Promo |
208D - Prizes Prizes more Prizes | 659A - Round House |
1492C - Maximum width | 171B - Star |
1512B - Almost Rectangle | 831B - Keyboard Layouts |
814A - An abandoned sentiment from past | 268C - Beautiful Sets of Points |
1391C - Cyclic Permutations | 11A - Increasing Sequence |
1406A - Subset Mex | 1365F - Swaps Again |
50B - Choosing Symbol Pairs | 1719A - Chip Game |