#include <bits/stdc++.h>
using namespace std;
int main()
{ float h,m,ans,i,j;
while(scanf("%f:%f",&h,&m)==2)
{
if(h==0 and m==0) break;;
i=h*30+(m/60)*30;
j=m*6;
ans=(i-j);
if(ans<0)
ans=ans*(-1);
if (ans>180)
ans=360-ans;
printf("%.3lf\n",ans);
}
return 0;
}
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