//No.2706 One Nafmo
#include <stdio.h>

int main(void){
    
    int A, B, X;
    scanf("%d %d %d", &A, &B, &X);

    int cnt = 0;
    while(X > 0){
        X = X - A;
        cnt++;
    }
    int result = cnt * B;

    printf("%d\n", result);

    return 0;
}