`#include<bits/stdc++.h> #define int long long using namespace std; int n; double s; signed main(){ cin>>n; if(n<70) cout<<50; else if(n<80) cout<<n; else if(n<90) cout<<n2; else cout<<n3; return 0; }

#include<bits/stdc++.h> using namespace std; int main(){ int n; cin>>n; if(n>=90)cout<<n3; else if(n>=80)cout<<n2; else if(n>=70)cout<<n; else cout<<50; return 0; }

```#include<bits/stdc++.h>
#define int long long
using namespace std;
int n;
double s;
signed main(){
    cin>>n;
    if(n<70) cout<<50;
    else if(n<80) cout<<n;
    else if(n<90) cout<<n*2;
    else cout<<n*3;
    return 0;
}