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52 lines
679 B

int main()
{
//newline=10;
int i;
int sum;
int a[10];
sum=0;
//m = 1478;
//int t;
i=0;
while(i<10)
{
a[i]=i+1;
i=i+1;
}
int x;
int high;
int low;
int mid;
int n;
n=10;
x=getint();
high=n-1;
low=0;
mid=(high+low)/2;
while(a[mid]!=x && low < high)
{
mid=(high+low)/2;
if(x<a[mid])
high=mid-1;
else
{
low = mid +1;
}
}
if(x==a[mid])
putint(x);
else
{
x = 0;
putint(x);
}
x = 10;
putch(x);
return 0;
}