I c++ program goes into infinity loop and gives unneccesary output?

Ok this is an program to input numbers and show how many times numbers are repeated or not. Program code is below.....

#include<iostream>

int main()
{
    int currval=0,val=0;
    if(std::cin>>currval)
    {
        int cnt=1;
        while(std::cin>>val)
        {
            if(currval==val)
            {
                ++cnt;
            }
            else
            {
                std::cout<<currval<<" occurs "<<cnt<<" times. "<<std::endl;
                currval=val;
                cnt=1;
            }

        }