#include<stdio.h>
int main()
{
long long int R,N,a,b,i,counter,m,test_case=0;
while(scanf("%lld%lld",&R,&N)==2)
{
if(R==0&&N==0)
{
break;
}
if(N>R)
{
printf("Case %lld: 0\n",++test_case);
continue;
}
a=R-N;
b=1;
counter=0;
for(i=1;i<=26;i++)
{
m=i*N;
if(m>=a)
{
b=0;
break;
}
}
if(b)
{
printf("Case %lld: impossible\n",++test_case);
}
else
{
printf("Case %lld: %lld\n",++test_case,i);
}
}
return 0;
}
int main()
{
long long int R,N,a,b,i,counter,m,test_case=0;
while(scanf("%lld%lld",&R,&N)==2)
{
if(R==0&&N==0)
{
break;
}
if(N>R)
{
printf("Case %lld: 0\n",++test_case);
continue;
}
a=R-N;
b=1;
counter=0;
for(i=1;i<=26;i++)
{
m=i*N;
if(m>=a)
{
b=0;
break;
}
}
if(b)
{
printf("Case %lld: impossible\n",++test_case);
}
else
{
printf("Case %lld: %lld\n",++test_case,i);
}
}
return 0;
}
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