Does "scanf" cancel the function "gets"?

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C

int flag=1,n;
    char string[200];
    printf("Enter number <0-5> : \n");
    scanf("%d",&n);
    printf("Insert string <bigger than the number above> : ");
    while(flag)
    {
        gets(string);
        flag=CheckNumOfWords(string,n);
    }

Hi guys
so when i run the script it doesn't pause so i can enter my string, he skips the func "gets(string)", but when i remove the "scanf("%d",&n)" the "gets(string)" workes fine
any suggestions or comments?
tnx!