#include <stdio.h>
#include <stdlib.h>

int main()
{
    unsigned int n;
    printf("Podaj liczbe n > 0 = "); scanf("%d",&n);
    int k = 0;
    do{ k++; }
    while( pow(k,2) <= n);
    printf("\k = %d\n",k-1);
    return 0;
}