#41385: 看看我


yp11351100@yphs.tp.edu.tw (801-28胡可岳)


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#include <iostream>
using namespace std;
 
int main() {
    int m;
    cin >> m;
     
    if (m <= 25) {
        cout << 25 - m << "\n";
    } else {
        cout << 60 - m + 25 << "\n";
    }
     
    return 0;
}