#include <stdio.h>
#define DEBUGr

#define NOP do{}while(0)
#ifdef DEBUG
#define TRACE(...) do{printf(__VA_ARGS__);fflush(stdout);}while(0)
#define TRACECR do{printf("\n");fflush(stdout);}while(0)
#else
#define TRACE(...) NOP
#define TRACECR NOP
#endif
int main( void ) {
    int hh,mm;
    double h,m;
    double vh,vm,vl;
    double kk = 0.;
    double min = 60.0 * 60.0;

    scanf("%d %d", &hh, &mm );
    h = (double)hh;
    m = (double)mm;
    TRACE("%02d:%02d\n",hh,mm);
    vm = m;
    TRACE("長針の進み具合 vm %.4f\n",vm);
    if( h >= 12.0 ) h -= 12.0;
    vh = (h * 5 ) + ( (h/12) * 5. );
    TRACE("短針の向きvh %.4f\n",vh);
    if( vh < vm ) {
        TRACE("先に長針がある\n");
        kk = (60 - mm)*60;
        TRACE("0までの秒数 kk %.4f\n",kk);
        h++;    if( h >= 12.0 ) h -= 12.0;
        TRACE("目標時刻 h%.4f\n",h);
        vl = (h * 60. ) /11.;
        TRACE("重なる向き(分) vl %.4f\n",vl);
        kk +=  (vl) * 60. ;
    } else if( vh > vm ) {
        TRACE("長針が後ろにある\n");
        kk = (60 - mm)*60;
        TRACE("0までの秒数 kk %.4f\n",kk);
        if( h >= 12.0 ) h -= 12.0;
        TRACE("目標時刻 h%.4f\n",h);
        vl = (h * 60. ) /11.;
        TRACE("重なる向き(分) vl %.4f\n",vl);
        kk = (vl * 60.0) - (mm * 60.);
    }
    printf("%.0f\n", kk  );
    return 0;
}