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using namespace std ;
int main()
    int h1 , m1 , h2 , m2 ,t1 , t2  ;
    while(scanf("%d %d %d %d",&h1,&m1 ,&h2 ,&m2))
        if ((h1+h2+m1+m2)==0)break ;
        t1 = h1*60 +m1 ;
        t2 = h2 *60 +m2 ;
            t2 = t2 + 60*24 ;

        printf("%d\n",t2-t1) ;
    return 0 ;

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