#include <iostream>
using namespace std;
 
int main ()
{
    long C, K;
    cin>>C>>K;
    // try: C = 1284, K = 2
    long min_money = 1;
    for (int i=1; i<=K; i++)
        min_money*=10;  // try -> min_money = 100
 
    long case_1 = (C/min_money)*min_money;    // try-> case_1 = 1200
    long case_2 = case_1 + min_money;    // try -> case_2 = 1300
 
    if (C-case_1 >= case_2-C)    // try -> C-case_1 = 84, case_2-C = 16
        cout<<case_2;
    else cout<<case_1;
    return 0;
}

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MTIzNDUwOTk1IDE=

123450995 1