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- #include <bits/stdc++.h>
- using namespace std;
- long long a, b, c, d;
- long long x, y, g, h;
- long long pierwszy_rzad;
- long long suma;
- long long z;
- int main ()
- {
- scanf("%lld%lld%lld%lld", &a, &b, &c, &d);
- x=a+b;
- y=c+d;
- h=c-a+1;
- g=d-b+1;
- pierwszy_rzad=x*h;
- pierwszy_rzad+=h*(h-1)/2;
- pierwszy_rzad*=g;
- suma=pierwszy_rzad;
- //printf("%d", pierwszy_rzad);
- suma+=h*(g*(g-1)/2);
- printf("%lld", suma);
- }
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