problem: (C) Tennis Championship Solve in C/C++ Archive

#include<stdio.h> main() { long long int n,i,j,c=0,a,b,k; scanf("%I64d",&n); a=1; b=1; k=a+b; while(k<=n) { c++; a=b; b=k; k=a+b; } printf("%I64d",c); }