import std;

void main () {
    int A, B, X; readln.read(A, B, X);
    writeln(B * ((X + A - 1) / A));
}

void read (T...) (string S, ref T args) {
    import std.conv : to;
    import std.array : split;
    auto buf = S.split;
    foreach (i, ref arg; args) {
        arg = buf[i].to!(typeof(arg));
    }
}