#include <stdio.h>
int main()
{
int l1, l2, l3, l4, desimal;
scanf("%d %d %d %d", &l1
, &l2
, &l3
, &l4
);
desimal=(8*l1)+(4*l2)+(2*l3)+(1*l4);
if ((l1==0)||(l1==1)||(l2==0)||(l2==1)||(l3==0)||(l3==1)||(l4==0)||(l4==1))
{
if(desimal=0){
}
else if(desimal=1){
}
else if(desimal=2){
}
else if(desimal=3){
}
else if(desimal=4){
}
else if(desimal=5){
}
else if(desimal=6){
}
else if(desimal=7){
}
else if(desimal=8){
}
else if(desimal=9){
}
}
}
return 0;
}
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