lampadashotel.c

#include <stdio.h>

int main(){

    int ia, ib, fa, fb;
    scanf("%d %d %d %d\n",&ia,&ib,&fa,&fb);

    int nclicks = 0;

    if ( ia == fa ) {
        if ( ib == fb ) {
            nclicks = 0;
        }
        else {
            nclicks = 2;
        }
    } else {
        if ( ib == fb ) {
            nclicks = 1;
        }
        else {
            nclicks = 1;
        }
    }

    println("%d\n",nclicks);

    return 0;

}