#includeint fib(int n){if(n<3)return 1; return fib(n-1)+fib(n-2);}int main(){int i,m,n,a=0,b=1,c,s=0; scanf("%d,%d",&m,&n); for(i=m;i<=n;i++) s+=fib(i); printf("sum=%d\n",s); return 0; }
