include<bits/stdc++.h>

using namespace std; int ans = 0; int sym; int main() {

int n;
cin>>n;
if(n < 0){
	sym = -1;
	n=-n;
}
else{
	sym = 1;
}
while(n != 0){
	ans = ans * 10 + n % 10;
	n = n / 10;
}
cout << sym * ans;
return 0;

}