#include <iostream>
using namespace std;
int main() {
int n;
cin >> n;
int a[n];
a[0] = 1;
a[1] = 1;
for (int i = 4; i <= n; i++)
{
a[i] = (a[i - 1] + a[i - 2]) % 10;
}
cout << a[n];
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwogCmludCBtYWluKCkgewogICAgaW50IG47CiAgICBjaW4gPj4gbjsKICAgIGludCBhW25dOwogICAgYVswXSA9IDE7CiAgICBhWzFdID0gMTsKICAgIGZvciAoaW50IGkgPSA0OyBpIDw9IG47IGkrKykKICAgIHsKICAgICAgICBhW2ldID0gKGFbaSAtIDFdICsgYVtpIC0gMl0pICUgMTA7CiAgICB9CiAgICBjb3V0IDw8IGFbbl07CiAgICByZXR1cm4gMDsKfQ==