#include<stdio.h>

int main(void){
    int c,k,b=1,a,m,br;
    scanf("%d",&c);
    scanf("%d",&k);
    
    while(k!=0){
        k--;
        b=b*10;
    }
    
    a=c/b;
    m=c%b;
    if(m>=5) br=1;
    else br=0;
    
    printf("%d",(a+br)*b);
    return 0;
}