In some program on C condition (line 19) and formula (line 20) and X value (line 22) was deleted:

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#include <stdio.h>
#include <stdlib.h>

inline int getparam(char* param) {
	int i = 0; int n = 0;
	while(param[i] != 0) {
		char cc=param[i];
		if (cc < 0x30 || cc > 0x39) exit(0);
		n = n * 10 + cc - 0x30;
		i += 1;
	}
	return n;
}

int main (int argc, char** argv) {
	int a = getparam(argv[1]);
	int b = getparam(argv[2]);
	int c;
	if (condition)
		c = formula;
	else c = a + b;
	c = c + X;
	printf("%i\n", c);
	return 0;
}

You have executable file which was compiled from this source code. It can be downloaded (button at right).

You must restore missed lines and write it on C and send to server as answer. It will insert this lines into source code, compile executable file and compare its functionality with original.

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Crazy calculator

Dislikes some numbers and
sums it with errors.
What numbers it dislikes?

Music and words are folk,
executes admin@reverseboom.club
En