#include<stdio.h>

#include<math.h>
int minTurns(int n);
int main() {
    float score_f;
    if (scanf("%f", &score_f) !=1) {
        printf("Invalid input\n");
        return 0;
    
    }
    if (score_f < 0) {
        printf("Invalid input\n");
        return 0;
        
    }
    int score_i = (int)score_f;
    if (fabs(score_f - score_i) > 0.0001) {
        
    }
    int result = minTurns(score_i);
    printf("%d\n",result);
    return 0;
    
}