#include <cstdio>
int main(){
    char A[3],B[3];
    scanf("%s %s",A,B);
    double wB=6*((B[0]-'0')*10+(B[1]-'0'));
    double wA=30*((A[0]-'0')*10+(A[1]-'0'))+0.50*((B[0]-'0')*10+(B[1]-'0'));
    double R=wA-wB+360;
    while(R>=360)R-=360;
    //printf("wa %d wb %d R %d\n",wA,wB,R);
    printf("%.0f",120*R/11);
    return 0;
}