#include <bits/stdc++.h>
using namespace std;

void stringPlus(string &a,string b){
    string c;
    while(a.size()!=b.size()){
        if(a.size()<b.size())a='0'+a;
        if(a.size()>b.size())b='0'+b;
    }
    int n=a.size();
    int carry=0;
    for(int i=n-1;i>=0;i--){
        int k=a[i]-'0'+b[i]-'0'+carry;
        c.push_back(k%10+'0');
        carry=k/10;
    }
    if(carry)c.push_back(carry+'0');
    reverse(c.begin(),c.end());
    a=c;
}

int main() {
    int a,n;
	while(cin>>a>>n){
	    string x,y,ans;
	    x.push_back(a+'0');
	    ans.push_back('0');
	    for(int i=0;i<n;i++){
	        y+=x;
	        stringPlus(ans,y);
	    }
	    for(auto x:ans)cout<<x;
	    cout<<endl;
	}
}

最后的输出如果是cout就无法输出，就会0%，但是用一个一个输出就能过，太难绷了