为什么这个不对捏

#include <stdio.h>

int main(void){
    int n = 0;
    int k;
    float sum = 0;

    scanf("%d", &k);
    
    do{
        n++;
        sum += (1.0 / n);
    }while(sum <= k);
    
    printf("%d", n);
    
    return 0;
}