#include #include #include int main(){ int n,i,j,sum=0,len; char s[10]={'\0'}; scanf("%d",&n); for(i=1;i<=10000;i++) { memset(s,'\0',10); sprintf(s,"%d",i); len=strlen(s); for(j=0;j { if(s[j]==n+48) { sum++; } } } printf("sum=%d",sum); return 0;}
