program W
implicit none
integer::X,Y,L
read*,X,Y,L
print"(i0)",merge(2,merge(1,0,X/=0),Y<0)&
+(abs(X))/L+merge(1,0,mod(ABS(X),L)/=0)&
+(abs(Y))/L+merge(1,0,mod(ABS(Y),L)/=0)
end program W