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#include<bits/stdc++.h>
using namespace std;
int n;
string m;
int div(string s, int a){
    int b[10010] = {};
    for(int i = 0; i < s.size(); i++) b[i] = s[i] - '0';
    int ans[10010] = {}, x = 0;
    for(int i = 0; i < s.size(); i++){
        ans[i] = (b[i] + x * 10) / a;
        x = (b[i] + x * 10) % a;
    }
    return x;
}
int main(){
    cin >> n >> m;
    cout << div(m, n);
    return 0;
}