plzz tell me what should i modify in this to solve the error time limit exceeded
http://www.codechef.com/problems/FCTRL here is the question
#include<stdio.h>
int main()
{ int b=0;
long int T;
long long int N;
scanf("%ld",&T);
while(T>0)
{ scanf("%lld",&N);
b=0;
while(N>1)
{ if(N%5==0||N%10==0)
b++;
N--;
}
printf("%d",b);
T--;
}
return(0);
}