#include<stdio.h>
int main()
{
int n,k,s,b,tb,r;
while(scanf("%d%d",&n,&k)==2)
{
s=n;
tb=0;
while(s>=k)
{
b=s/k;
s=b+s%k;
tb=tb+b;
}
printf("%d\n",n+tb);
}
return 0;
}
int main()
{
int n,k,s,b,tb,r;
while(scanf("%d%d",&n,&k)==2)
{
s=n;
tb=0;
while(s>=k)
{
b=s/k;
s=b+s%k;
tb=tb+b;
}
printf("%d\n",n+tb);
}
return 0;
}
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