#include typedef long long ll; #define rep(i, b) for(int i = 0; i < b; i++) #define repi(i, a, b) for(int i = a; i < b; i++) #if defined(_MSC_VER) || __cplusplus > 199711L #define aut(r,v) auto r = (v) #else #define aut(r,v) __typeof(v) r = (v) #endif #define each(it,o) for(aut(it, (o).begin()); it != (o).end(); ++ it) #define MAX_V 1001 #define MAX_E 401 #define MOD 1000000007 #define EPS 1e-5 #define INF INT_MAX #define PI 3.141 inline ll toll(std::string s) { ll v; std::istringstream sin(s); sin >> v; return v; } template inline std::string toString(T x) { std::ostringstream sout; sout << x; return sout.str(); } using namespace std; typedef pair pii; int main() { ll X, Y, L, ans = 0; cin >> X >> Y >> L; if (X != 0) { ans++; } if (Y < 0) { ans += 2; } ans += abs(X) % L == 0 ? abs(X) / L : (abs(X) / L) + 1; ans += abs(Y) % L == 0 ? abs(Y) / L : (abs(Y) / L) + 1; cout << ans << endl; return 0; }