#include <stdio.h> #include #include <math.h> using namespace std; int main() { int x1 , y1 , x2 , y2; cin>> x1 >> y1 >> x2 >> y2; int a , b , a1 , b1 , d; a = x1 - x2 ; b = y1 - y2 ; a1 = fabs(a); b1 = fabs(b); d = a1 + b1; cout << d ;

}