# include <stdio.h>
int main ( )
{
    
int n , k;
n = k = 0;
k = 4;
double Sn = 0;
for (n=1 ; Sn < k ; n++ )
{
	Sn = Sn + 1/n;//为什么用1运行不了，而1.0却可以运行 
							
} 
printf ("%d",n);

return 0;
}