#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <math.h>
int main(void)
{
    float sokudo,jikan;
    scanf("%f %f",&sokudo,&jikan);
    jikan+=0.0001;
    floor(jikan);
    int ans = sokudo*jikan;
    printf("%d",ans);
}