Submission #73774641

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define int long long

void blank(){cout << "\n";}
template<class T>
inline void prt(T x){cout << x;}
template<class T>
inline void prtk(T x){cout << x << " ";}
template<class T>
inline void inp(T &x){cin >> x;}
template<class T>
inline void to(T &x,T y){x = y;}
inline int lowbit(int x){return x & -x;}

uint8_t buf[1 << 20],*p1,*p2;
#define gc()(p1 == p2 && (p2 = (p1 = buf) + fread(buf,1,1 << 20,stdin)),*p1++)
int readint()
{
	int k = 0,f = 1,c = gc();
	for(;!isdigit(c);c = gc()){if (c == '-'){f = -1;}}
	for(;isdigit(c);c = gc()){k = k * 10 + (c ^ 48);}
	return k * f;
}
//debug:输入完后,记得ctrl + Z

#define ll long long
#define pii pair<int,int>
#define pll pair<long long,long long>
#define sig signed
#define usig unsigned
#define si signed int
#define ui unsigned int
#define sll signed long long
#define ull unsigned long long

int n,x,ams;

signed main()
{
	cin >> n >> x;
	while(n--)
	{
		int xx,y;
		cin >> xx >> y;
		if(xx < x)
		{
			int g = (x - xx) * y;
			ams += g;
		}
	}
	cout << ams;
}

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