579-Clock hand

#include<stdio.h>
int main()
{
    float H,M,totalM,passh,passm,block;
    //freopen("in.txt","r",stdin);
    while(scanf("%f:%f",&H,&M)&&(H!=0 || M!=0))
    {
        totalM=H*60 + M;
        passh = 5*totalM/60;
        if(passh > 60)
            passh=passh-60;
        passm = (int)totalM%60;
        block=(passh > passm)?(passh-passm)*6:(passm-passh)*6;
        if(block > 180)
            block=360-block;
        printf("%.3f\n",block);
    }
    return(0);
}