#include <iostream>
#include <cstdio>
#include <cmath>

using namespace std;

int main() {
    int c, ki, k = 1, o;   scanf( "%d %d", &c, &ki );
    
    if( ki == 0 ) { printf( "%d\n", c ); scanf( "%%" ); return 0; }
    
    for( int i = 0; i < ki; i++ ) k *= 10;
    
    o = c % k;
    
    float r;
    r = static_cast<float>( o ) / k;
    
    if( r >= 0.5 ) c += k - o;
    else           c -= o;
    
    
    //printf( "%d %d %f\n", o, k, r );
    printf( "%d\n", c );
    
    scanf( "%%" );
    return 0;
}