// #pragma GCC optimize("O3,unroll-loops,fast-math")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define fi first
#define se second

using namespace std;

const int Nmax=1e6+105,inf=1e9,MOD=1e9+7;

int a[Nmax],len;

void add(ll x) {
    ll carry=x;
    for (int i=0; i<len; ++i) {
        carry+=a[i];
        a[i]=carry%10;
        carry/=10;
    }
    while (carry) {
        a[len++]=carry%10;
        carry/=10;
    }
}

int main() {
    ifstream cin("next.in");
    ofstream cout("next.out");
    
    string s;
    ll d;
    cin>>s>>d;
    len=s.size();
    reverse(s.begin(), s.end());
    for (int i=0; i<len; ++i) a[i]=s[i]-'0';
    ll r=0;
    for (int i=len-1; i>=0; --i) r=(r*10+a[i])%d;
    if (r) add(d-r);
    for (int i=len-1; i>=0; --i) cout<<a[i];
    
    return 0;
}