#include <iostream>
#include <vector>
#include <string>
#include <cassert>
int remaining(int total, int done) { return done >= total ? 0 : total - done; }
int main() {
    assert(remaining(4,1)==3);
    assert(remaining(4,4)==0);
    assert(remaining(4,5)==0);
    assert(remaining(0,0)==0);
    std::cout << "Passed\n";
}