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#include<iostream>
using namespace std;
int main() {
    double y=0.0;
    cin>>y;
    double x=0.0;
    if(y<=45) x=3500+y/0.03;
    else if(y>45 && y<=345) x=5000+ (y-45)/0.1;
    else if(y>345 && y<=1245) x=8000 + (y-345)/0.2;
    else if(y>1245 && y<=7745) x=12500+(y-1245)/0.25;
    else if(y>7745 && y<=13745) x=38500+(y-7745)/0.3;
    else if(y>13745 && y<=22495) x=58500+(y-13745)/0.35;
    else if(y>22495) x=83500 + (y-22495)/0.45;
    cout << (int)x << endl;
}
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