请问这里的思路哪里有问题，输出的答案不正确

#include<stdio.h>
#include<conio.h>
void main()
{
int m; printf("input:\n");
scanf("%d",&m);
m = m*100;
int s = 0;
int count = 0;
int n = 1;
while( s<=m ) {
s += n;
count++;
n *= 2;
}
printf("\n%d\n",count);
getch();
}