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#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<algorithm>
#include<cstring>
#define inf 0x7fffffff
#define ll long long
using namespace std;
inline ll read(){
  ll x=0,f=1;char ch=getchar();
  while(ch>'9'||ch<'0'){if(ch=='-')f=-1;ch=getchar();}
  while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
    return x*f;
}
void cal(){
        int T,h,m,s,tt;
        double angle1,angle2,ret;
        scanf("%d%d%d%d",&h,&m,&s,&tt);
        s+=tt;
        m+=s/60;s%=60;
        h+=m/60;m%=60;
        h%=12;if(h==0)h+=12;
        
        if(h>12)h-=12;
        angle1=30.0*h+30/60.0*m+30/3600.0*s;
        angle2=6.0*m+6/60.0*s;  
        ret=angle1-angle2;
        ret=ret<0?-ret:ret;
        ret=ret>180?360-ret:ret;
        printf("%.4f\n",ret);
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