// yukicoder: No.350 d=vt
// 2019.4.15 bal4u

#include <stdio.h>
#include <ctype.h>

//// 高速入力
#if 1
#define gc() getchar_unlocked()
#else
#define gc() getchar()
#endif
int in()    // 非負整数の入力
{
	int n = 0, c = gc();
	do n = 10 * n + (c & 0xf), c = gc(); while (isdigit(c));
	return n;
}

int main()
{
	int v, t;
	v = in() * 10000 + in();
	t = in();
	printf("%d\n", v*t / 10000);
	return 0;
}