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1078.cpp
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1078.cpp
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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define PI (acos(-1))
#define ct cout<<
#define cn cin>>
#define spc <<" "<<
#define nl puts("")
#define _fl(x) puts("FLAG " #x);
#define _(x) cout<< #x <<" is "<< x <<endl;
#define fs first
#define sc second
#define pb push_back
#define all(v) (v).begin(), (v).end()
#define _109 (1000000000)
#define _0(arr) memset(arr,0,sizeof ( arr ) )
#define _1(arr) memset(arr,-1,sizeof ( arr ) )
#define _ninp(n,arr) for(int i=0; i<n;i++)cin>>arr[i];
#define _nout(n,arr) for(int i=0; i<n;i++)cout<<arr[i]<<" \n"[i==n-1];
double _eps=1e-6;
long long gcd(long long a, long long b) {
if (b == 0)
return a;
return gcd(b, a % b);
}
ll md(int p,int m){
if(p==0)return 1;
ll x=md(p/2,m);
if(p&1){
x=(x*x*10)%m;
}
else {
x=(x*x)%m;
}
return x;
}
int main() {
int T;
cn T;
for(int caseno=1; caseno<=T ;caseno++){
int n,dig;
cn n>>dig;
ll res=0;
for (int i = 0; i <2*n; ++i)
{
res=(res+md(i,n)*dig)%n;
if(res==0){
printf("Case %d: %d\n",caseno,i+1);
break;
}
}
}
return 0;
}