View Code of Problem 23

#include<stdio.h>
int main(){
    int M;
    scanf("%d",&M);
    while (M!=0) {
        if (M == 1) {
            printf("1\n");
        } else if (M == 2) {
            printf("2\n");
        } else {
            long long int small;
            long long int big;
            long long int sum=0;
            long long int temp;
            small=1;
            big=1;
            for (int i = 3; i <=M ; i++) {
                temp=small;
                small=big;
                big=big+temp;
                sum=big+small;
            }
            printf("%lld\n",sum);
        }
        scanf("%d",&M);
    }
    return 0;
}