- #include<bits/stdc++.h>
- using namespace std;
- int main() {
- double n;
- cin >> n;
- if(n < 1) {
- cout << "y=" << fixed << setprecision(2) << n << endl;
- } else if(n >= 1 && n < 10) {
- cout << "y=" << fixed << setprecision(2) << 2 * n - 1 << endl;
- } else {
- cout << "y=" << fixed << setprecision(2) << 3 * n - 11 << endl;
- }
- return 0;
- }
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