#include <stdio.h>

int main()
{
	int x,y,z;
	int sum = 0;
	int age = 1;
	
	scanf("%d %d %d\n", &x, &y, &z);
	
	while(sum < z){
		sum += (age % x == 0) ? y : 1;
		printf("sum[%d] = %d\n", age, sum);
		if(sum < z){
			age++;
		}
	}
	printf("%d\n", age);
	return (0);
}