/*tim so k sao cho 4^k nho hon n*/

#include<stdio.h>

#include<conio.h>

#include<math.h>

int main()

{

    long n,k,t;

    printf("nhap so tu nhien n:");scanf("%d",&n);

    k=0;

    t=1;

    while(t<n)

    {

        k++;/*k dung de dem so lan thuc hien*/

        t=pow(4,k);/*ket qua dung ham luy thua va ham pow ko khac nhau*/

    }

    printf("so k lon nhat can tim la:%d",k-1);/*k-1 cho ta so k can tim*/

    getch();

    return 0;

}

/*

long luythua(long k)

{

     long t=1;

     for(int i=1;i<=k;i++)

         t=t*4;

     return t;

}

*/