#include <stdio.h>
int main() {
double a, b, c, d, x;
x = a;
if (b > x) {
x = b;
}
if (c > x) {
x = c;
}
if (d > x) {
x = d;
}
if ((a + c) < (b - d)) {
x = x + (a + c);
}
else {
x = x + (b - d);
}
return 0;
}
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