Lab task - 2

#include <bits/stdc++.h>

#define ll long long
#define ull unsigned long long
#define uom unordered_map
#define pb push_back
#define yes cout<<"YES\n"
#define no cout<<"NO\n"

#define dot(x) fixed<<setprecision(x)
#define wrench786 ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);

#define PI (acos(-1.0))
#define eps 0.00001
const int LIMIT = 10000*1;
using namespace std;


int main(){
    int mark;
    cin>>mark;
    if(mark<40) cout<<"F\n";
    else if(mark>=40 && mark<45) cout<<"D\n";
    else if(mark>= 45 && mark<50) cout<<"C\n";
    else if(mark>=50 && mark<55) cout<<"C+\n";
    else if(mark>=55 && mark<60) cout<<"B-\n";
    else if(mark>=60 && mark<65) cout<<"B\n";
    else if(mark>=65 && mark<70) cout<<"B+\n";
    else if(mark>=70 && mark<75) cout<<"A-\n";
    else if(mark>=75 && mark<80) cout<<"A\n";
    else if(mark>=80) cout<<"A+\n";
}