#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main(){
    char a[50000];
    int b;
    cin>>a;
	cin>>b;
    int aa[50000]={},c[50000]={},lena=strlen(a);
    for(int i=0;i<=lena;i++)aa[i]=a[i]-'0';
    long long x=0;
    for(int i=0;i<lena;i++){
    	c[i]=(x*10+aa[i])/b;
        x=(x*10+aa[i])%b;
	}
    cout<<x;
}

四分求助各位大佬