#include using namespace std;

int main() { string n; long long x, y, a, b = 0; cin >> x >> n;

int l = n.size();


if (n == "GiB") {
	cout << x * 1024 * 1024 * 1024;
}
if (n == "MiB") {
	cout << x * 1024 * 1024;
}
if (n == "KiB") {
	cout << x * 1024;
}


if (n == "GB") {
	cout << x * 1000 * 1000 * 1000;
}
if (n == "MB") {
	cout << x * 1000 * 1000;
}
if (n == "KB") {
	cout << x * 1000;

}

return 0;

}