const M: i64 = 1000000007;

fn powmod(x: i64, y: i64, m: i64) -> i64 {
    if y == 0 { return 1; }
    let mut ans = powmod(x, y>>1, m);
    ans = ans * ans % m;
    if (y&1) == 1 { ans = ans * x % m; }
    ans
}

fn main() {
    let mut scanner = Scanner::new();
    let b = scanner.next_i64() % M;
    let c = scanner.next_i64() % M;
    let d = scanner.next_i64();

    let s = if c == 1 {
                d % M
            } else {
                let mut v = (powmod(c, d+1, M)-c) * powmod(c-1, M-2, M) % M;
                if v < 0 { v += M }
                v
            };

    println!("{}", s * b % M);
}


struct Scanner {
    reader: std::io::Stdin,
    tokens: std::collections::VecDeque<String>,
}

impl Scanner {
    fn new() -> Self {
        Scanner {
            reader: std::io::stdin(),
            tokens: std::collections::VecDeque::new(),
        }
    }

    fn next(&mut self) -> String {
        if self.tokens.is_empty() {
        let mut s = String::new();
            loop {
                self.reader.read_line(&mut s).ok();
                let s = s.trim();
                if s.len() != 0 {
                    for it in s.split_whitespace() {
                        self.tokens.push_back(it.into())
                    }
                    break;
                }
            }
        }
        self.tokens.pop_front().unwrap()
    }

    fn next_generics<T>(&mut self) -> T where
        T: std::str::FromStr + std::marker::Copy,
        <T as std::str::FromStr>::Err: std::fmt::Debug
    {
        self.next().parse().unwrap()
    }
    
    #[allow(dead_code)] fn next_i32(&mut self) -> i32 { self.next_generics::<i32>() }
    #[allow(dead_code)] fn next_i64(&mut self) -> i64 { self.next_generics::<i64>() }
    #[allow(dead_code)] fn next_u64(&mut self) -> u64 { self.next_generics::<u64>() }
    #[allow(dead_code)] fn next_usize(&mut self) -> usize { self.next_generics::<usize>() }
}