uses crt;
var i,t:integer;
begin
clrscr;
t:=0;
for i:=100 to 200 do
if i mod 2=1 then t:=t+i;
writeln(t);
readln;
end.
#include <bits/stdc++.h>
using namespace std;
long long test;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
cout<<((199-101)/2+1)*(199+101)/2;
return 0;
}