#include <bits/stdc++.h> using namespace std;

int main() { int a,b; cin>>a>>b; cout<<a%b<<endl; return 0; }

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#include后面加

#include using namespace std;

int main() { int a,b; cin>>a>>b; cout<<a%b<<endl;

return 0;

#include using namespace std;

int main() { int a,b; cin>>a>>b; cout<<a%b;

return 0;

}