diff --git a/4.c b/4.c
new file mode 100644
index 0000000..78f3dea
--- /dev/null
+++ b/4.c
@@ -0,0 +1,151 @@
+#include <stdio.h>
+int s=3;
+int main()
+{
+	void log();
+	log();
+	return 0;
+}
+
+void log()
+{
+	float sum(float a[][6]);
+	void sort(float a[][6]);
+	float student[4][6];
+	int i,j;
+    student[0][0]=10001;
+    student[0][1]=11;
+    student[0][2]=99.5;
+    student[0][3]=88.5;
+    student[0][4]=89.5;
+    student[1][0]=10002;
+    student[1][1]=12;
+    student[1][2]=77.9;
+    student[1][3]=56.5;
+    student[1][4]=87.5;
+    student[2][0]=10003;
+    student[2][1]=11;
+    student[2][2]=92.5;
+    student[2][3]=99.5;
+    student[2][4]=60.5;
+    for(j=0;j<5;j++)
+    {
+    	scanf("%f",&student[3][j]);
+	}
+	sum(student);
+	sort(student);
+	for(i=0;i<4;i++)
+	{
+		for(j=0;j<5;j++)
+		{
+			if(j<2)
+			{
+				printf("%g",student[i][j]);
+			}
+			else
+			{
+				printf("%4.1f",student[i][j]);
+			}
+			if(j==4)
+			{
+				if(i==s)
+				{
+					printf(" inserted");
+				}
+				printf("\n");
+			}
+			else
+			{
+				printf(" ");
+			}
+		}
+	}
+}
+
+float sum(float a[][6])
+{
+	int i;
+	for(i=0;i<4;i++)
+	{
+		a[i][5]=a[i][2]+a[i][3]+a[i][4];
+	}
+}
+
+void sort(float a[][6])
+{
+	void swap(float a[][6],int x,int y);
+	void sort2(float a[][6],int n,int m);
+	int i,j,k;
+	int min;
+	for(i=0;i<4;i++)
+	{
+		min=a[i][1];
+		k=i;
+		for(j=i;j<4;j++)
+		{
+			if(min>a[j][1])
+			{
+				min=a[j][1];
+				k=j;
+			} 
+		}
+		swap(a,i,k);
+	}
+	k=1;
+	j=0;
+	for(i=0;i<4;i++)
+	{
+		if(a[i][1]==a[i+1][1])
+		{
+			k++;
+		}
+		else
+		{
+			sort2(a,k,j);
+			j=j+k;
+			k=1;
+		}
+	}
+}
+
+void sort2(float a[][6],int n,int m)
+{
+	void swap(float a[][6],int x,int y);
+	int i,j,k;
+	int max;
+	for(i=m;i<m+n;i++)
+	{
+		max=a[i][5];
+		k=i;
+		for(j=i;j<m+n;j++)
+		{
+			if(max<a[j][5])
+			{
+				max=a[j][5];
+				k=j;
+			}
+		}
+		swap(a,i,k);
+	}
+}
+
+void swap(float a[][6],int x,int y)
+{
+	int i;
+	float temp;
+	if(x==s)
+	{
+		s=y;
+	}
+	if(y==s)
+	{
+		s=x;
+	}
+	for(i=0;i<6;i++)
+	{
+		temp=a[x][i];
+		a[x][i]=a[y][i];
+		a[y][i]=temp;
+	}
+}
+