X,Y,N=map(int,input().split())
for _ in range(N):
    U,V=map(int,input().split())
    if (U-1)//Y==(V-1)//Y or U==0 or V==0:
        if U==0:
            print((V-1)%Y+1)
        elif V==0:
            print((U-1)%Y+1)
        else:
            print(max(U,V)-min(U,V))
    else:
        print((U-1)%Y+1+(V-1)%Y+1)