x,y,n = map(int,input().split()) ans = [] for _ in range(n): u,v = map(int,input().split()) if u == 0: ans.append((v-1)%y+1) continue elif (u-1)//y == (v-1)//y: ans.append(v-u) else: ans.append((u-1)%y+(v-1)%y+2) for i in range(n): print(ans[i])