#include <iostream>
using namespace std;
 
int main() {
	int a,b,m;
 
	cin >> a >> b >> m;
 
	int am;
 
	if(a<m)
	    am = m-a;
	else if(a<m)
	   am = a-m;
 
	return 0;
 
 
}
 
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