#include<bits/stdc++.h> using namespace std; int main(){ /** int n,m; cin>>n>>m; for(int i=n;i<=m;i++){ cout<<char(i+96)<<" "; } double h=100; for(int i=1;i<=10;i++){ h/=2; } printf("%.6lf",h); int a,m,g,s,b,q,cnt=0; cin>>a; for(int i=1;i<=a;i++){ cin>>m; g = m/1%10; s = m/10%10; b = m/100%10; q = m/1000%10; if(g-q-b-s>0){ cnt++; } } cout<<cnt; int a=1; int n; cin>>n; for(int i=0;i<n-1;i++){ a = a+i; } cout<<a<<endl; **/ int a=10000; int n; cin>>n; if(n%2==0){ a = a-(n/2-1)*2; }else{ a = a-(n/2)*1; } cout<<a; return 0; }