#include<stdio.h>

int main(){
	int b, c, d;
	scanf("%d%d%d", &b, &c, &d);
	int num = b*c;
	for (int i = 1; i <= d-1; i++){
		num = num + b;
		num *= c;
	}
	printf("%d", num % 1000000007);
	return 0;
}