ZCMU 1214: 斐波那契数列

#include
int main()
{
	int a,b,d,c,i;
	while(scanf("%d",&a)!=EOF){
		b=1;
		c=1;
		if(a==0){
			printf("1\n");
		}
		else{
			for(i=1;i<=a;i++){
				d=b+c;
				c=b;
				b=d;
				
			}
			
			printf("%d\n",c);
		}
		
	}
	return 0;
}